diff --git a/day-7/.gitignore b/day-7/.gitignore
new file mode 100644
index 0000000..b83d222
--- /dev/null
+++ b/day-7/.gitignore
@@ -0,0 +1 @@
+/target/
diff --git a/day-7/Cargo.lock b/day-7/Cargo.lock
new file mode 100644
index 0000000..14366e2
--- /dev/null
+++ b/day-7/Cargo.lock
@@ -0,0 +1,128 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
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+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "day-7"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+ "lazy_static",
+ "regex",
+]
+
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+ "indoc-impl",
+ "proc-macro-hack",
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+
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+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
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+
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+[[package]]
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+ "unicode-xid",
+]
+
+[[package]]
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+ "proc-macro2",
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+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+ "thread_local",
+]
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+[[package]]
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+[[package]]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
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+ "lazy_static",
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+
+[[package]]
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+
+[[package]]
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diff --git a/day-7/Cargo.toml b/day-7/Cargo.toml
new file mode 100644
index 0000000..a9ba4c2
--- /dev/null
+++ b/day-7/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "day-7"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"
+lazy_static = "1.4"
+regex = "1.4"
diff --git a/day-7/input b/day-7/input
new file mode 100644
index 0000000..d63893c
--- /dev/null
+++ b/day-7/input
@@ -0,0 +1,594 @@
+dull silver bags contain 2 striped magenta bags, 2 dark coral bags, 1 bright orange bag, 4 plaid blue bags.
+dark plum bags contain 3 wavy teal bags.
+wavy turquoise bags contain 3 bright salmon bags.
+mirrored gold bags contain 3 wavy brown bags, 5 posh beige bags, 3 light crimson bags, 3 vibrant salmon bags.
+drab green bags contain 4 dull white bags, 1 posh indigo bag.
+faded lime bags contain 1 dim magenta bag, 1 wavy salmon bag, 4 dull purple bags.
+mirrored blue bags contain 5 bright orange bags, 1 muted black bag, 2 muted brown bags, 2 vibrant gold bags.
+faded crimson bags contain 4 wavy teal bags, 4 mirrored fuchsia bags, 3 plaid white bags.
+faded magenta bags contain 2 clear orange bags, 5 dull green bags, 2 pale white bags.
+pale red bags contain 5 shiny gold bags, 4 dull gold bags, 2 drab black bags.
+dark coral bags contain 1 light turquoise bag.
+faded chartreuse bags contain 4 shiny brown bags, 4 mirrored beige bags, 4 clear purple bags.
+muted coral bags contain 4 pale coral bags, 4 plaid brown bags.
+bright teal bags contain 5 striped blue bags, 4 faded orange bags, 2 faded crimson bags.
+wavy green bags contain 5 dim chartreuse bags.
+clear white bags contain 2 mirrored fuchsia bags.
+clear aqua bags contain 1 faded beige bag.
+vibrant yellow bags contain 5 posh brown bags.
+pale lavender bags contain 1 striped beige bag, 2 striped cyan bags.
+mirrored lime bags contain 3 bright orange bags.
+faded tan bags contain 2 drab beige bags.
+dark indigo bags contain 1 dark brown bag, 5 shiny beige bags, 1 vibrant indigo bag.
+drab teal bags contain 2 vibrant fuchsia bags, 3 muted green bags, 5 dotted magenta bags, 2 shiny lavender bags.
+shiny aqua bags contain 1 shiny gold bag, 4 clear white bags, 4 faded gold bags.
+dull bronze bags contain 4 vibrant teal bags, 1 vibrant violet bag.
+dark aqua bags contain 4 posh white bags.
+dim coral bags contain 2 light yellow bags.
+faded salmon bags contain 5 muted brown bags, 2 dotted red bags, 3 drab yellow bags, 4 dark red bags.
+bright lavender bags contain 5 wavy maroon bags, 5 light brown bags, 5 bright silver bags, 1 dark gray bag.
+mirrored cyan bags contain 4 dotted cyan bags, 5 striped orange bags, 1 vibrant gold bag.
+drab aqua bags contain 3 striped black bags, 4 dark salmon bags, 1 drab white bag, 4 faded crimson bags.
+striped purple bags contain 5 faded yellow bags, 2 faded brown bags.
+drab fuchsia bags contain 4 vibrant violet bags, 5 mirrored yellow bags.
+shiny red bags contain 3 faded cyan bags, 1 dull beige bag, 1 shiny blue bag, 5 dull cyan bags.
+mirrored teal bags contain 4 clear brown bags, 5 light bronze bags, 3 light teal bags, 2 pale tomato bags.
+dotted orange bags contain 3 dull white bags, 2 wavy blue bags.
+dotted lavender bags contain 1 vibrant aqua bag, 4 shiny magenta bags, 3 dull plum bags.
+pale crimson bags contain 4 muted cyan bags, 1 posh brown bag, 3 light magenta bags.
+shiny black bags contain 4 vibrant chartreuse bags, 1 mirrored yellow bag, 3 posh brown bags, 5 vibrant violet bags.
+clear bronze bags contain 5 dull violet bags, 3 pale plum bags.
+striped lavender bags contain 1 dark plum bag, 2 striped yellow bags.
+plaid indigo bags contain 2 plaid chartreuse bags.
+shiny teal bags contain 4 wavy gray bags, 4 drab teal bags, 1 dark silver bag.
+dull turquoise bags contain 1 wavy gray bag.
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+plaid yellow bags contain 5 drab black bags, 1 wavy lavender bag, 1 drab silver bag.
+muted blue bags contain 5 posh aqua bags.
+shiny olive bags contain 4 dark salmon bags, 1 faded gold bag, 3 drab chartreuse bags, 4 dotted yellow bags.
+vibrant lime bags contain 4 shiny aqua bags, 1 bright maroon bag, 4 striped orange bags.
+dim crimson bags contain 5 faded crimson bags.
+vibrant gray bags contain 1 mirrored coral bag, 5 wavy beige bags, 3 drab turquoise bags.
+posh chartreuse bags contain 3 light plum bags, 2 pale green bags, 5 drab white bags.
+striped beige bags contain 5 dull red bags, 5 drab salmon bags, 3 vibrant salmon bags.
+dotted tan bags contain 4 wavy crimson bags, 4 shiny orange bags, 1 drab turquoise bag.
+vibrant aqua bags contain 1 vibrant gray bag, 5 light violet bags, 3 dim yellow bags.
+faded turquoise bags contain 2 faded yellow bags, 4 mirrored coral bags.
+mirrored purple bags contain 3 pale orange bags.
+dim white bags contain 1 drab turquoise bag.
+bright purple bags contain 5 muted chartreuse bags, 1 dotted yellow bag, 3 bright salmon bags.
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+pale magenta bags contain 4 vibrant turquoise bags, 3 clear gold bags.
+posh gold bags contain 5 dotted lime bags, 5 wavy silver bags, 4 muted crimson bags, 1 dull yellow bag.
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+faded violet bags contain 2 mirrored bronze bags.
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+striped bronze bags contain 4 striped white bags, 1 dim yellow bag, 5 clear aqua bags.
+muted aqua bags contain 5 plaid green bags.
+wavy teal bags contain no other bags.
+pale black bags contain 5 dark salmon bags.
+clear gold bags contain 2 plaid white bags, 5 drab coral bags, 5 pale coral bags.
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+wavy olive bags contain 5 dark aqua bags, 1 light yellow bag, 1 shiny crimson bag.
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+clear brown bags contain 4 wavy teal bags, 4 drab violet bags.
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+wavy yellow bags contain 3 dotted gold bags, 3 posh green bags.
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+dark lime bags contain 5 vibrant chartreuse bags, 2 clear brown bags, 1 posh brown bag.
+muted magenta bags contain 4 shiny silver bags, 2 dotted yellow bags, 4 pale fuchsia bags, 5 muted tan bags.
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+muted teal bags contain 3 dim black bags, 4 mirrored lavender bags, 5 dull indigo bags, 3 clear red bags.
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+vibrant red bags contain 4 light teal bags, 5 shiny fuchsia bags, 1 drab purple bag, 2 muted olive bags.
+mirrored tomato bags contain 4 posh brown bags.
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+dotted gold bags contain 5 pale aqua bags, 1 bright olive bag.
+dotted violet bags contain 2 drab olive bags, 1 plaid cyan bag, 2 posh beige bags.
+pale fuchsia bags contain 5 faded beige bags, 5 dark purple bags.
+shiny chartreuse bags contain 1 striped tan bag, 5 pale tomato bags.
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+vibrant tomato bags contain 1 clear crimson bag, 3 pale purple bags, 3 faded gray bags.
+light orange bags contain 5 plaid brown bags.
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+faded green bags contain 2 dotted gold bags, 1 dark plum bag, 1 dull gray bag, 5 dark brown bags.
+dim gray bags contain 5 muted white bags, 2 mirrored yellow bags, 1 muted tomato bag.
+faded black bags contain 3 faded teal bags, 3 striped lavender bags, 2 striped blue bags, 4 muted lavender bags.
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+faded olive bags contain 1 vibrant gray bag, 4 drab teal bags, 5 wavy teal bags.
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+dotted black bags contain 4 shiny crimson bags, 5 dark salmon bags, 5 faded crimson bags, 2 vibrant magenta bags.
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+dotted brown bags contain 4 faded teal bags, 5 mirrored coral bags.
+muted silver bags contain 5 striped black bags, 3 faded beige bags, 4 plaid crimson bags, 2 wavy brown bags.
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+drab gold bags contain 1 faded gold bag, 5 shiny gold bags.
+posh bronze bags contain 2 drab aqua bags, 5 pale gray bags.
+light tomato bags contain 5 wavy lime bags.
+dull tan bags contain 3 drab blue bags, 4 dull green bags, 4 clear violet bags.
+muted beige bags contain 5 clear white bags, 5 faded crimson bags.
+faded fuchsia bags contain 5 plaid purple bags, 1 shiny silver bag, 4 muted violet bags.
+bright green bags contain 5 dim teal bags, 5 shiny crimson bags, 5 clear crimson bags.
+mirrored fuchsia bags contain 4 posh white bags, 5 wavy teal bags, 2 dark violet bags.
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+drab cyan bags contain 4 dim tomato bags, 1 plaid lavender bag, 4 pale red bags, 2 drab olive bags.
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+dark blue bags contain 5 posh aqua bags.
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+wavy gray bags contain 3 drab white bags, 2 muted lavender bags.
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+dark bronze bags contain 4 faded turquoise bags, 2 faded silver bags, 5 faded salmon bags.
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+mirrored magenta bags contain 5 vibrant lime bags, 4 vibrant chartreuse bags, 3 striped aqua bags.
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+drab tan bags contain 5 vibrant violet bags.
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+posh gray bags contain 5 mirrored lime bags.
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+muted indigo bags contain 1 dark green bag, 1 plaid chartreuse bag, 3 bright indigo bags, 5 wavy silver bags.
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+vibrant coral bags contain 5 plaid white bags, 5 vibrant indigo bags.
+wavy white bags contain 1 plaid green bag, 3 drab chartreuse bags, 1 posh white bag.
+pale violet bags contain 2 shiny orange bags, 4 plaid crimson bags.
+clear black bags contain 4 wavy blue bags, 5 plaid tan bags, 4 clear magenta bags.
+faded aqua bags contain 2 wavy teal bags.
+dotted green bags contain 5 shiny orange bags, 1 light magenta bag.
+bright coral bags contain 2 shiny fuchsia bags, 4 light lime bags, 1 shiny gold bag.
+vibrant fuchsia bags contain 1 vibrant chartreuse bag, 1 striped black bag.
+dark turquoise bags contain 5 shiny salmon bags, 2 light lavender bags.
+shiny green bags contain 1 pale silver bag, 4 dim red bags, 3 dark lime bags, 4 drab coral bags.
+clear red bags contain 5 light teal bags, 5 posh brown bags.
+dull gold bags contain 1 drab tan bag, 4 striped tomato bags, 5 pale maroon bags, 2 dim crimson bags.
+mirrored red bags contain 3 shiny crimson bags, 4 plaid brown bags, 2 shiny black bags.
+pale blue bags contain 1 wavy crimson bag, 4 faded beige bags, 4 shiny chartreuse bags.
+clear beige bags contain 4 plaid crimson bags, 5 shiny crimson bags.
+drab salmon bags contain 4 dim crimson bags, 3 light magenta bags, 1 clear violet bag.
+vibrant magenta bags contain 4 dim black bags.
+dark salmon bags contain 3 dull green bags, 4 faded red bags.
+posh white bags contain no other bags.
+light lime bags contain 5 dark aqua bags.
+vibrant salmon bags contain 4 striped tomato bags, 4 clear aqua bags.
+clear teal bags contain 3 striped gray bags.
+plaid silver bags contain 3 vibrant violet bags, 2 muted magenta bags, 3 dark olive bags, 4 mirrored gold bags.
+striped cyan bags contain 4 light gold bags, 2 dotted magenta bags.
+wavy bronze bags contain 1 plaid crimson bag, 1 dull gray bag, 5 dull tan bags, 1 mirrored teal bag.
+dim olive bags contain 4 vibrant lime bags, 2 shiny crimson bags, 2 muted turquoise bags.
+dotted blue bags contain 4 vibrant gray bags, 2 shiny beige bags.
+plaid blue bags contain 5 drab silver bags.
+dark olive bags contain 1 pale coral bag, 4 vibrant indigo bags.
+pale gray bags contain 3 dotted crimson bags, 1 striped magenta bag, 5 wavy white bags, 2 vibrant blue bags.
+mirrored brown bags contain 2 bright cyan bags, 4 plaid brown bags, 5 faded turquoise bags.
+wavy gold bags contain 1 wavy coral bag.
+pale teal bags contain 3 vibrant magenta bags.
+mirrored turquoise bags contain 4 mirrored olive bags, 5 bright yellow bags.
+dark chartreuse bags contain 4 dotted cyan bags, 5 shiny turquoise bags, 5 vibrant salmon bags, 4 wavy yellow bags.
+muted gray bags contain 3 dim orange bags.
+posh turquoise bags contain 4 clear lavender bags, 5 dim coral bags, 2 striped salmon bags.
+shiny cyan bags contain 4 striped gold bags.
+drab olive bags contain 2 plaid cyan bags, 1 mirrored lime bag.
+posh tomato bags contain 2 drab tan bags, 3 shiny orange bags.
+muted fuchsia bags contain 1 pale salmon bag, 3 wavy violet bags, 3 mirrored maroon bags.
+pale bronze bags contain 3 drab yellow bags, 3 muted chartreuse bags.
+striped green bags contain 3 striped orange bags, 2 dull green bags, 3 vibrant tan bags.
+faded orange bags contain 3 mirrored plum bags, 5 mirrored lime bags, 5 faded red bags.
+dull aqua bags contain 2 striped coral bags.
+dotted olive bags contain 4 faded salmon bags, 1 wavy green bag.
+vibrant silver bags contain 4 mirrored yellow bags, 2 dotted salmon bags, 3 drab silver bags.
+striped olive bags contain 1 mirrored fuchsia bag, 1 faded gold bag, 1 mirrored lavender bag.
+dark violet bags contain no other bags.
+mirrored olive bags contain 5 dull teal bags, 1 dim white bag.
+plaid tan bags contain 4 pale gray bags, 2 dim crimson bags, 1 clear violet bag, 1 wavy lime bag.
+pale tomato bags contain 5 posh green bags, 4 faded red bags.
+dim turquoise bags contain 1 shiny gold bag, 5 drab blue bags.
+muted lime bags contain 3 vibrant lime bags, 1 pale plum bag, 1 dark indigo bag.
+drab beige bags contain 3 vibrant magenta bags.
+posh beige bags contain 2 dark violet bags.
+muted olive bags contain 2 pale brown bags, 5 light gray bags, 3 wavy green bags, 2 drab tan bags.
+dim orange bags contain 1 clear lime bag, 4 faded beige bags, 2 mirrored fuchsia bags.
+dull salmon bags contain 4 striped coral bags, 3 striped aqua bags.
+dull maroon bags contain 3 clear brown bags, 5 dull magenta bags, 1 dim red bag.
+mirrored coral bags contain 5 muted tan bags, 4 dotted magenta bags, 5 dim olive bags.
+posh olive bags contain 4 dull magenta bags, 4 wavy blue bags, 2 drab yellow bags, 5 dotted gold bags.
+mirrored violet bags contain 2 pale fuchsia bags.
+drab bronze bags contain 4 drab chartreuse bags.
+wavy fuchsia bags contain 2 dark gray bags, 5 muted silver bags.
+pale plum bags contain 3 vibrant salmon bags, 5 drab chartreuse bags, 2 posh violet bags.
+mirrored aqua bags contain 2 pale aqua bags.
+bright silver bags contain 3 drab black bags, 5 dark salmon bags, 2 shiny beige bags, 2 posh lavender bags.
+plaid lime bags contain 4 faded teal bags, 5 pale brown bags, 5 dim red bags.
+dotted turquoise bags contain 3 dim olive bags, 2 mirrored blue bags, 3 dull lime bags, 4 vibrant lavender bags.
+drab maroon bags contain 5 bright red bags.
+wavy lavender bags contain 1 striped lime bag, 1 posh brown bag.
+shiny beige bags contain 5 shiny aqua bags, 3 muted teal bags, 5 clear gold bags.
+dark gold bags contain 4 clear maroon bags, 2 dotted maroon bags, 3 light red bags.
+light aqua bags contain 2 dim red bags, 3 pale red bags.
+posh teal bags contain 3 muted brown bags, 5 shiny gold bags, 5 dotted purple bags.
+dull lavender bags contain 5 shiny blue bags.
+dark tan bags contain 1 muted tan bag, 5 vibrant turquoise bags, 4 dark violet bags, 4 muted plum bags.
+light beige bags contain 2 mirrored fuchsia bags, 1 drab chartreuse bag, 1 muted tan bag.
+pale olive bags contain 3 clear brown bags.
+dark maroon bags contain 5 dull plum bags, 3 muted green bags.
+muted red bags contain 4 pale tan bags, 1 bright white bag.
+light tan bags contain 3 light purple bags, 2 pale aqua bags, 3 wavy bronze bags.
+clear magenta bags contain 3 vibrant chartreuse bags, 1 dim crimson bag.
+dark orange bags contain 2 posh cyan bags, 1 wavy brown bag, 5 dull black bags.
+dim lavender bags contain 5 drab fuchsia bags.
+dotted beige bags contain 5 light blue bags, 4 plaid tan bags, 2 wavy maroon bags, 5 dim crimson bags.
+dim green bags contain 3 plaid tan bags, 1 drab blue bag, 1 clear aqua bag.
+plaid brown bags contain 3 muted turquoise bags, 4 drab chartreuse bags.
+bright black bags contain 5 striped white bags.
+plaid gold bags contain 3 shiny lime bags, 1 plaid maroon bag, 4 bright blue bags.
+pale white bags contain 4 drab chartreuse bags, 3 pale tan bags, 5 pale aqua bags.
+drab violet bags contain no other bags.
+light magenta bags contain 3 faded crimson bags.
+light gold bags contain 1 dim lavender bag, 3 light magenta bags, 5 drab gold bags.
+plaid coral bags contain 1 vibrant salmon bag, 3 striped tomato bags, 3 posh blue bags.
+dotted white bags contain 1 wavy lavender bag.
+striped yellow bags contain 4 drab black bags, 2 faded red bags, 2 shiny gold bags, 4 dark aqua bags.
+dark yellow bags contain 5 wavy bronze bags, 5 bright purple bags.
+faded white bags contain 3 light tomato bags.
+muted white bags contain 5 faded gold bags, 1 plaid magenta bag, 3 drab white bags, 5 dim brown bags.
+faded red bags contain 1 posh brown bag, 2 muted turquoise bags, 3 plaid crimson bags, 4 shiny orange bags.
+dark red bags contain 5 shiny salmon bags.
+dull gray bags contain 2 posh white bags.
+bright salmon bags contain 2 shiny aqua bags, 3 dotted crimson bags, 1 drab violet bag, 4 pale chartreuse bags.
+mirrored chartreuse bags contain 1 vibrant magenta bag, 3 plaid salmon bags, 1 plaid chartreuse bag, 3 muted violet bags.
+vibrant orange bags contain 5 posh yellow bags.
+dark gray bags contain 1 plaid chartreuse bag, 2 drab violet bags, 1 bright chartreuse bag, 1 muted purple bag.
+mirrored crimson bags contain 3 drab coral bags, 5 dull lime bags.
+muted violet bags contain 3 dotted crimson bags, 3 light olive bags.
+shiny brown bags contain 2 dark lavender bags, 2 vibrant yellow bags, 1 dark black bag, 2 drab olive bags.
+muted green bags contain 1 dull cyan bag, 5 dull red bags, 4 pale chartreuse bags.
+drab yellow bags contain 3 pale tomato bags.
+dotted tomato bags contain 2 shiny magenta bags, 3 mirrored tomato bags, 5 plaid chartreuse bags.
+plaid red bags contain 3 pale cyan bags.
+bright red bags contain 1 shiny beige bag.
+plaid purple bags contain 5 dull gold bags.
+dark green bags contain 3 pale salmon bags, 3 dim brown bags, 2 wavy violet bags, 2 pale chartreuse bags.
+plaid orange bags contain 1 vibrant chartreuse bag, 2 dotted coral bags, 1 posh teal bag.
+plaid violet bags contain 1 shiny maroon bag.
+posh tan bags contain 1 shiny beige bag, 2 dim magenta bags, 1 dark violet bag.
+bright aqua bags contain 1 drab brown bag, 4 dotted purple bags.
+vibrant white bags contain 4 light gray bags, 2 dark fuchsia bags, 1 pale cyan bag.
+striped red bags contain 5 faded gold bags, 5 drab crimson bags, 3 faded turquoise bags.
+dull purple bags contain 1 pale crimson bag.
+shiny blue bags contain 1 pale violet bag, 5 mirrored plum bags, 3 posh white bags, 1 light yellow bag.
+clear salmon bags contain 2 striped lime bags, 1 dull violet bag.
+faded gold bags contain 3 light teal bags, 3 wavy teal bags.
+mirrored yellow bags contain 2 muted turquoise bags, 4 drab chartreuse bags.
+plaid gray bags contain 4 plaid plum bags.
+plaid white bags contain no other bags.
+drab black bags contain 2 mirrored yellow bags, 2 drab chartreuse bags, 1 shiny orange bag.
+dotted chartreuse bags contain 2 vibrant cyan bags, 2 light salmon bags, 3 vibrant red bags, 5 light turquoise bags.
+faded lavender bags contain 3 dark tomato bags, 5 muted lime bags, 4 light fuchsia bags, 4 dull lavender bags.
+vibrant cyan bags contain 2 clear crimson bags, 3 pale orange bags, 4 dull indigo bags, 3 light red bags.
+bright maroon bags contain 2 muted tan bags, 2 light teal bags.
+drab silver bags contain 3 bright chartreuse bags, 4 pale crimson bags, 5 dotted crimson bags, 5 faded yellow bags.
+drab purple bags contain 5 drab blue bags.
+dim gold bags contain 1 bright cyan bag, 5 dull white bags, 3 vibrant blue bags.
+dark beige bags contain 4 pale coral bags, 1 pale indigo bag.
+dotted salmon bags contain 2 drab violet bags, 5 posh white bags.
+vibrant crimson bags contain 5 faded teal bags, 3 dotted green bags, 1 clear maroon bag.
+dim chartreuse bags contain 3 clear white bags.
+bright violet bags contain 1 dim yellow bag, 1 muted purple bag, 4 muted teal bags, 5 striped cyan bags.
+dim magenta bags contain 1 pale aqua bag, 4 pale maroon bags, 5 mirrored red bags, 4 drab yellow bags.
+dim brown bags contain 5 faded salmon bags, 4 dotted magenta bags, 5 drab tomato bags, 2 faded teal bags.
+shiny lime bags contain 5 dotted black bags, 4 plaid turquoise bags, 2 dim tomato bags, 2 clear magenta bags.
+drab magenta bags contain 3 dark beige bags.
+faded cyan bags contain 2 striped lime bags, 4 bright red bags.
+dark brown bags contain 4 mirrored lime bags, 1 bright orange bag.
+posh fuchsia bags contain 5 shiny gold bags, 5 pale salmon bags, 1 light coral bag, 1 mirrored plum bag.
+shiny magenta bags contain 4 dark aqua bags.
+dark lavender bags contain 1 pale purple bag, 3 vibrant yellow bags.
+vibrant brown bags contain 2 posh teal bags, 1 wavy silver bag, 2 pale plum bags.
+muted black bags contain 5 faded crimson bags, 3 dim crimson bags, 4 vibrant magenta bags.
+muted brown bags contain 5 striped olive bags, 5 dark brown bags, 2 clear brown bags, 4 plaid white bags.
+pale orange bags contain 4 bright blue bags, 3 dark aqua bags, 1 clear gold bag.
+light cyan bags contain 3 muted silver bags.
+drab white bags contain 2 drab tan bags, 2 striped tomato bags, 4 dull gray bags, 5 drab blue bags.
+dim tan bags contain 3 mirrored bronze bags, 3 faded salmon bags, 4 drab purple bags.
+dull tomato bags contain 3 clear lime bags.
+wavy aqua bags contain 3 dotted orange bags, 5 shiny crimson bags.
+shiny lavender bags contain 5 vibrant blue bags, 4 pale purple bags, 1 wavy bronze bag, 2 posh violet bags.
+shiny white bags contain 5 faded blue bags, 5 pale cyan bags.
+wavy blue bags contain 4 vibrant chartreuse bags, 4 plaid brown bags, 3 plaid white bags, 2 faded gold bags.
+striped magenta bags contain 2 dark olive bags, 5 bright chartreuse bags.
+vibrant black bags contain 4 plaid white bags, 2 dull silver bags, 5 striped purple bags, 1 dark plum bag.
+dull green bags contain 2 dull crimson bags.
+vibrant chartreuse bags contain 2 bright orange bags, 4 dark aqua bags.
+dim violet bags contain 2 dark teal bags, 4 plaid brown bags, 4 mirrored yellow bags.
+clear blue bags contain 5 posh maroon bags.
+faded tomato bags contain 5 clear beige bags, 4 bright orange bags.
+posh violet bags contain 3 clear gold bags.
+striped tomato bags contain 2 shiny black bags.
+muted crimson bags contain 4 light aqua bags, 3 dim gold bags.
+clear tan bags contain 4 drab tomato bags, 4 mirrored bronze bags, 1 shiny chartreuse bag.
+posh magenta bags contain 4 posh red bags, 3 light bronze bags.
+dim blue bags contain 5 dim gray bags, 1 light turquoise bag, 5 muted bronze bags.
+drab plum bags contain 1 vibrant plum bag, 4 striped coral bags.
+pale silver bags contain 5 drab black bags.
+posh purple bags contain 2 dark brown bags.
+drab indigo bags contain 1 muted lavender bag, 2 posh salmon bags, 1 pale brown bag.
+striped blue bags contain 4 wavy teal bags.
+wavy magenta bags contain 1 dotted salmon bag, 1 drab black bag, 2 dull tan bags, 1 drab silver bag.
+pale turquoise bags contain 4 dark lime bags, 4 drab maroon bags.
+shiny tan bags contain 4 plaid coral bags, 3 dim black bags, 1 dull plum bag.
+light teal bags contain 3 dark violet bags.
+mirrored silver bags contain 1 striped salmon bag, 1 clear chartreuse bag, 2 clear orange bags, 2 posh aqua bags.
+wavy coral bags contain 2 muted teal bags, 1 wavy white bag.
+wavy crimson bags contain 1 shiny aqua bag, 3 muted beige bags.
+shiny bronze bags contain 1 posh indigo bag, 5 wavy blue bags, 1 faded gold bag, 3 striped tomato bags.
+shiny maroon bags contain 1 clear tomato bag, 1 wavy crimson bag.
+bright turquoise bags contain 3 dull tan bags, 3 vibrant teal bags.
+faded purple bags contain 1 plaid chartreuse bag.
+bright white bags contain 2 faded gold bags.
+clear orange bags contain 4 striped blue bags, 2 mirrored lime bags, 5 muted turquoise bags.
+clear cyan bags contain 1 dim plum bag, 3 shiny brown bags, 1 muted purple bag, 2 plaid lime bags.
+plaid teal bags contain 2 faded aqua bags, 4 wavy olive bags.
+dotted lime bags contain 5 posh olive bags, 2 pale orange bags.
+muted tan bags contain 1 dull gray bag, 2 dark aqua bags, 1 pale violet bag.
+striped orange bags contain 3 mirrored lime bags, 2 dull crimson bags, 4 faded gold bags, 3 pale silver bags.
+light olive bags contain 2 dark tan bags, 3 dim orange bags, 5 mirrored yellow bags.
+plaid magenta bags contain 2 wavy orange bags, 1 wavy chartreuse bag, 5 striped coral bags.
+dark magenta bags contain 3 bright white bags, 3 plaid purple bags, 3 striped black bags, 4 light beige bags.
+dark black bags contain 3 pale tan bags, 4 mirrored orange bags, 3 dull teal bags.
+posh orange bags contain 4 bright aqua bags, 1 dim crimson bag, 4 dim turquoise bags, 1 dotted bronze bag.
+dull crimson bags contain 4 vibrant violet bags.
+clear turquoise bags contain 1 muted brown bag, 2 dull yellow bags, 3 pale black bags, 1 plaid crimson bag.
+vibrant blue bags contain 2 clear beige bags.
+dull lime bags contain 4 shiny plum bags, 3 vibrant magenta bags, 3 dark olive bags.
+drab brown bags contain 4 clear green bags.
+mirrored plum bags contain 2 faded red bags.
+shiny fuchsia bags contain 2 muted cyan bags, 4 dark aqua bags, 3 light olive bags, 2 clear gold bags.
+vibrant purple bags contain 3 pale aqua bags, 3 dark lime bags, 1 bright chartreuse bag.
+bright crimson bags contain 1 vibrant gold bag.
+shiny plum bags contain 2 clear olive bags, 4 dark plum bags.
+shiny crimson bags contain no other bags.
+dull beige bags contain 1 mirrored coral bag.
+dim salmon bags contain 1 clear tomato bag, 2 shiny teal bags, 4 plaid olive bags, 3 plaid purple bags.
+muted maroon bags contain 2 muted violet bags, 4 dark white bags.
+pale aqua bags contain 4 dark beige bags, 1 muted brown bag.
+bright plum bags contain 4 dim black bags.
+striped tan bags contain 3 bright orange bags, 3 dark violet bags, 4 drab blue bags, 2 vibrant lime bags.
+clear crimson bags contain 3 wavy brown bags, 1 faded blue bag, 2 striped cyan bags.
+dim indigo bags contain 3 dotted lime bags, 1 dotted purple bag.
+pale tan bags contain 2 drab blue bags, 5 dim orange bags, 5 wavy olive bags, 3 striped tomato bags.
+vibrant bronze bags contain 5 clear red bags, 5 posh red bags.
+dotted bronze bags contain 1 light yellow bag.
+wavy salmon bags contain 2 striped olive bags, 4 muted teal bags.
+shiny turquoise bags contain 3 dark teal bags, 1 plaid yellow bag.
+faded maroon bags contain 1 vibrant salmon bag, 5 dotted magenta bags, 1 faded tan bag, 5 striped tomato bags.
+vibrant teal bags contain 4 light teal bags, 3 pale orange bags, 5 drab white bags.
+vibrant gold bags contain 1 muted cyan bag, 2 mirrored plum bags, 1 drab coral bag, 4 dark lime bags.
+bright cyan bags contain 2 muted silver bags, 5 plaid bronze bags, 3 light beige bags, 2 faded crimson bags.
+shiny silver bags contain 4 mirrored fuchsia bags, 2 clear violet bags, 3 faded beige bags.
+dark tomato bags contain 4 clear lime bags, 2 light beige bags, 3 bright turquoise bags.
+mirrored indigo bags contain 5 posh chartreuse bags, 5 clear tomato bags.
+dotted indigo bags contain 2 drab olive bags, 2 dim indigo bags, 5 dotted magenta bags.
+shiny gray bags contain 4 muted chartreuse bags, 4 plaid gray bags, 3 dull red bags, 5 striped orange bags.
+dim yellow bags contain 1 muted cyan bag, 4 mirrored fuchsia bags, 1 faded gold bag, 1 drab turquoise bag.
+bright lime bags contain 5 shiny bronze bags, 3 wavy aqua bags, 4 plaid turquoise bags.
+dotted gray bags contain 2 shiny gold bags.
+striped black bags contain 1 wavy teal bag, 5 dim chartreuse bags, 4 mirrored lavender bags.
+pale beige bags contain 2 posh black bags, 4 clear white bags.
+posh indigo bags contain 5 plaid white bags.
+dull blue bags contain 4 dark violet bags, 2 clear magenta bags, 4 dotted crimson bags.
+mirrored white bags contain 5 faded yellow bags.
+bright brown bags contain 3 pale gray bags.
+light gray bags contain 3 clear magenta bags, 5 wavy brown bags, 3 dotted salmon bags.
+muted orange bags contain 1 bright magenta bag, 1 bright plum bag.
+clear purple bags contain 1 shiny gold bag, 1 dark white bag.
+striped coral bags contain 5 pale gray bags, 3 wavy chartreuse bags.
+plaid green bags contain no other bags.
+plaid maroon bags contain 5 posh brown bags, 3 striped crimson bags, 4 plaid green bags.
+light maroon bags contain 3 muted gray bags, 5 dull crimson bags, 2 shiny maroon bags.
+pale purple bags contain 2 striped white bags, 3 plaid chartreuse bags, 1 mirrored lime bag.
+muted yellow bags contain 5 vibrant purple bags, 1 dark teal bag.
+plaid olive bags contain 1 light crimson bag, 1 faded gold bag, 1 vibrant blue bag.
+dim beige bags contain 4 muted silver bags, 3 mirrored beige bags, 4 striped violet bags.
+striped chartreuse bags contain 3 dull teal bags.
+muted salmon bags contain 2 posh salmon bags, 2 posh silver bags.
+dim red bags contain 2 drab blue bags, 4 plaid crimson bags, 3 vibrant gold bags.
+dull magenta bags contain 5 faded crimson bags, 1 shiny orange bag, 1 dark tan bag.
+plaid beige bags contain 1 vibrant turquoise bag.
+striped teal bags contain 2 dim chartreuse bags, 4 dark green bags.
+dotted plum bags contain 2 light cyan bags.
+dotted yellow bags contain 5 posh black bags, 5 dull tan bags, 2 dull violet bags, 5 muted plum bags.
+dotted coral bags contain 1 striped tomato bag, 2 light crimson bags, 3 clear violet bags.
+dull fuchsia bags contain 3 plaid purple bags, 4 mirrored red bags.
+dull yellow bags contain 5 vibrant violet bags, 2 dark olive bags.
+dull white bags contain 5 posh olive bags, 5 pale tomato bags, 2 bright teal bags.
+pale brown bags contain 3 dim crimson bags, 3 pale indigo bags, 1 dim chartreuse bag, 4 muted teal bags.
+shiny violet bags contain 1 muted tomato bag, 2 dull yellow bags, 1 drab teal bag.
+drab blue bags contain 3 vibrant gold bags, 4 drab black bags.
+posh lavender bags contain 5 shiny plum bags, 3 drab salmon bags, 4 dim brown bags, 4 plaid blue bags.
+dull teal bags contain 2 drab turquoise bags, 1 shiny crimson bag, 5 shiny aqua bags.
+shiny purple bags contain 3 drab orange bags, 4 dark red bags, 4 vibrant fuchsia bags, 2 light fuchsia bags.
+pale salmon bags contain 2 plaid chartreuse bags, 3 striped white bags.
+posh silver bags contain 4 clear magenta bags, 5 light magenta bags.
+light salmon bags contain 4 vibrant olive bags.
+striped turquoise bags contain 1 faded magenta bag, 3 shiny indigo bags, 4 striped lavender bags.
+dotted crimson bags contain 2 pale silver bags, 2 striped magenta bags, 1 striped white bag.
+dull brown bags contain 5 clear crimson bags, 1 dotted green bag, 4 dull magenta bags, 3 dim tan bags.
+plaid cyan bags contain 1 striped orange bag, 2 muted cyan bags.
+muted lavender bags contain 5 mirrored fuchsia bags.
+dim lime bags contain 1 muted black bag.
+light bronze bags contain 1 dull crimson bag, 5 dim chartreuse bags.
+dull olive bags contain 2 vibrant coral bags, 3 shiny teal bags, 4 plaid purple bags.
+posh yellow bags contain 5 dark lime bags, 3 mirrored plum bags.
+bright fuchsia bags contain 1 striped silver bag.
+posh maroon bags contain 4 dotted magenta bags, 4 posh yellow bags, 2 drab beige bags.
+posh salmon bags contain 2 muted green bags.
+mirrored gray bags contain 4 striped silver bags.
+dull cyan bags contain 2 bright orange bags, 4 dark plum bags.
+light crimson bags contain 3 drab fuchsia bags, 3 bright blue bags, 1 dark purple bag.
+light red bags contain 3 dim maroon bags, 4 muted green bags, 3 dotted olive bags.
+dull indigo bags contain 2 plaid brown bags, 1 wavy white bag, 2 vibrant turquoise bags, 5 drab chartreuse bags.
+drab crimson bags contain 2 vibrant salmon bags.
+posh red bags contain 3 mirrored violet bags, 1 striped tomato bag, 2 striped olive bags.
+drab chartreuse bags contain no other bags.
+posh lime bags contain 3 drab violet bags, 1 bright coral bag.
+wavy red bags contain 4 striped gray bags, 3 posh salmon bags, 1 dotted violet bag, 3 striped aqua bags.
+striped fuchsia bags contain 3 bright crimson bags, 3 dark silver bags, 1 clear magenta bag, 3 drab salmon bags.
+striped plum bags contain 2 drab tan bags, 5 pale gold bags, 1 dull white bag, 1 clear coral bag.
+mirrored maroon bags contain 1 dark magenta bag, 1 plaid purple bag, 2 light gray bags.
+shiny indigo bags contain 2 drab teal bags.
+dim silver bags contain 1 striped aqua bag, 3 dull tan bags, 3 striped tan bags, 2 wavy maroon bags.
+shiny salmon bags contain 5 faded beige bags.
+dull black bags contain 3 vibrant plum bags, 2 plaid chartreuse bags, 1 muted brown bag, 2 clear tomato bags.
+clear plum bags contain 3 striped maroon bags, 2 dark white bags.
+vibrant green bags contain 5 light orange bags, 5 mirrored magenta bags, 3 bright teal bags, 2 striped brown bags.
+drab gray bags contain 1 plaid maroon bag, 2 pale tan bags, 1 plaid white bag.
+wavy lime bags contain 2 clear gold bags, 2 bright chartreuse bags, 1 faded crimson bag.
+light silver bags contain 4 dim maroon bags, 1 mirrored teal bag.
+light brown bags contain 5 muted magenta bags.
+dim fuchsia bags contain 5 pale purple bags, 5 wavy orange bags, 5 clear lime bags.
+vibrant maroon bags contain 4 light gray bags.
+dim purple bags contain 2 muted white bags, 2 shiny aqua bags.
+clear olive bags contain 3 bright olive bags.
+drab lavender bags contain 4 mirrored crimson bags, 3 bright violet bags, 5 posh gold bags, 2 bright olive bags.
+light yellow bags contain 1 posh brown bag, 2 pale violet bags.
+plaid crimson bags contain 1 plaid green bag, 3 shiny crimson bags.
+pale indigo bags contain 3 clear aqua bags, 2 pale silver bags.
+mirrored bronze bags contain 4 muted tomato bags, 4 bright white bags, 1 faded crimson bag.
+dim teal bags contain 1 muted salmon bag.
+clear violet bags contain 2 dim coral bags, 2 faded beige bags.
+dotted silver bags contain 2 posh plum bags, 4 pale chartreuse bags.
+pale gold bags contain 2 vibrant gold bags, 1 dotted magenta bag.
+posh crimson bags contain 4 dull yellow bags, 3 clear fuchsia bags.
+dull orange bags contain 3 dull silver bags, 3 clear violet bags, 4 clear chartreuse bags, 3 faded salmon bags.
+striped lime bags contain 5 mirrored plum bags, 4 faded gold bags, 3 wavy white bags, 3 light teal bags.
+mirrored tan bags contain 4 dull silver bags, 4 light coral bags, 2 plaid lavender bags.
+wavy tomato bags contain 4 clear orange bags, 5 shiny fuchsia bags, 3 light red bags.
+dotted teal bags contain 5 dark salmon bags, 1 light indigo bag, 4 pale white bags, 5 clear olive bags.
+bright olive bags contain 1 dark tan bag, 4 striped orange bags, 3 bright orange bags.
+plaid plum bags contain 1 shiny maroon bag, 1 dotted coral bag.
+bright chartreuse bags contain 2 wavy blue bags.
diff --git a/day-7/src/main.rs b/day-7/src/main.rs
new file mode 100644
index 0000000..a427514
--- /dev/null
+++ b/day-7/src/main.rs
@@ -0,0 +1,182 @@
+use std::collections::HashMap;
+use std::fs;
+
+use lazy_static::lazy_static;
+use regex::Regex;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("input")?;
+    let rules = parse_rules(&input)?;
+
+    // Part 1
+    println!("{}", count_containing_bags(&rules, "shiny gold"));
+
+    // Part 2
+    println!("{}", count_contained_bags(&rules, "shiny gold"));
+
+    Ok(())
+}
+
+fn parse_rule(input: &str) -> Result<HashMap<String, usize>, std::num::ParseIntError> {
+    // Rules look something like:
+    //
+    //     <value> <key> bags?, <value> <key> bags?.
+    //
+    // or:
+    //
+    //     no other bags.
+
+    lazy_static! {
+        static ref RULE_RE: Regex = Regex::new(r"(\d+) (.+?) bags?").expect("Should compile");
+    };
+
+    if let "no other bags." = input {
+        Ok(HashMap::new())
+    } else {
+        RULE_RE
+            .captures_iter(input)
+            .map(|captures| Ok((captures[2].to_string(), captures[1].parse::<usize>()?)))
+            .collect()
+    }
+}
+
+fn parse_rules(input: &str) -> Result<HashMap<&str, HashMap<String, usize>>, String> {
+    input
+        .lines()
+        .map(|line| {
+            // Each line looks something like:
+            //
+            //     <key> bags contain <rule>
+            //
+            // So we simply split on " bags contain " and pass the
+            // rest to the rule parsing function.
+
+            // Note this will be a lot easier once str::split_once is stable
+            let (key, rule) = {
+                let temp: Vec<&str> = line.split(" bags contain ").collect();
+                if temp.len() != 2 {
+                    Err(format!("Invalid format for bag rule: {}", line))
+                } else {
+                    Ok((temp[0], temp[1]))
+                }
+            }?;
+
+            Ok((
+                key,
+                parse_rule(rule).map_err(|e| format!("Could not parse rule '{}': {}", rule, e))?,
+            ))
+        })
+        .collect()
+}
+
+fn count_containing_bags(rules: &HashMap<&str, HashMap<String, usize>>, color: &str) -> usize {
+    fn contains_recursively(
+        rules: &HashMap<&str, HashMap<String, usize>>,
+        rule: &HashMap<String, usize>,
+        color: &str,
+    ) -> bool {
+        // A bag contains the given color recursively, if either it
+        // contains the color, or any bags it contains contain the bag
+        // recursively
+        rule.contains_key(color)
+            || rule.keys().any(|bag| {
+                if let Some(rule) = rules.get(bag.as_str()) {
+                    contains_recursively(rules, rule, color)
+                } else {
+                    // The bag should always be in our index, but in
+                    // case it's not, we treat it as if it contains no other bags.
+                    false
+                }
+            })
+    }
+
+    // Count from how many bags the given bag is reachable
+    rules
+        .iter()
+        .filter(|(_, rule)| contains_recursively(rules, rule, color))
+        .count()
+}
+
+fn count_contained_bags(rules: &HashMap<&str, HashMap<String, usize>>, color: &str) -> usize {
+    if let Some(rule) = rules.get(color) {
+        // Count how many bags are reachable from this bag; except
+        // multiply the numbers by the number of each bag contained
+        rule.iter()
+            .map(|(contained, number)| number + number * count_contained_bags(rules, contained))
+            .sum()
+    } else {
+        // The bag should always be in our index, but in case it's
+        // not, we treat it as if it contains 0 other bags.
+        0
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use indoc::indoc;
+
+    #[test]
+    fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "
+            light red bags contain 1 bright white bag, 2 muted yellow bags.
+            dark orange bags contain 3 bright white bags, 4 muted yellow bags.
+            bright white bags contain 1 shiny gold bag.
+            muted yellow bags contain 2 shiny gold bags, 9 faded blue bags.
+            shiny gold bags contain 1 dark olive bag, 2 vibrant plum bags.
+            dark olive bags contain 3 faded blue bags, 4 dotted black bags.
+            vibrant plum bags contain 5 faded blue bags, 6 dotted black bags.
+            faded blue bags contain no other bags.
+            dotted black bags contain no other bags.
+            "
+        );
+
+        let rules = parse_rules(&input)?;
+        assert_eq!(count_containing_bags(&rules, "shiny gold"), 4);
+
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "
+            light red bags contain 1 bright white bag, 2 muted yellow bags.
+            dark orange bags contain 3 bright white bags, 4 muted yellow bags.
+            bright white bags contain 1 shiny gold bag.
+            muted yellow bags contain 2 shiny gold bags, 9 faded blue bags.
+            shiny gold bags contain 1 dark olive bag, 2 vibrant plum bags.
+            dark olive bags contain 3 faded blue bags, 4 dotted black bags.
+            vibrant plum bags contain 5 faded blue bags, 6 dotted black bags.
+            faded blue bags contain no other bags.
+            dotted black bags contain no other bags.
+            "
+        );
+
+        let rules = parse_rules(&input)?;
+        assert_eq!(count_contained_bags(&rules, "shiny gold"), 32);
+
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple3() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "
+            shiny gold bags contain 2 dark red bags.
+            dark red bags contain 2 dark orange bags.
+            dark orange bags contain 2 dark yellow bags.
+            dark yellow bags contain 2 dark green bags.
+            dark green bags contain 2 dark blue bags.
+            dark blue bags contain 2 dark violet bags.
+            dark violet bags contain no other bags.
+            "
+        );
+
+        let rules = parse_rules(&input)?;
+        assert_eq!(count_contained_bags(&rules, "shiny gold"), 126);
+
+        Ok(())
+    }
+}