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+See: https://adventofcode.com/2020/day/2
+** Part 1
+*** Purpose
+Given a list of passwords and their supposed requirements
+
+#+begin_example
+1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc
+#+end_example
+
+Return the amount of valid passwords. Password one requires 1-3 'a' characters. Password 2 is invalid.
+
+*** Method
+Simply parse each input and store them in... Well, let's do a list:
+
+#+begin_example
+(passwd char (min max))
+#+end_example
+
+Then, create a function count occurances of CHAR in PASSWD, and see how it compares to RANGE.
+
+** Part 2
+*** Purpose
+The password verification method has changed:
+
+#+begin_example
+1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc
+#+end_example
+
+Now, the "range" corresponds to two indices (indexed from 1). Of these indices, exactly one needs to be the given CHAR.