Advent of Code

--- Day 4: High-Entropy Passphrases ---

   A new system policy has been put in place that requires all
   accounts to use a passphrase instead of simply a password. A
   passphrase consists of a series of words (lowercase letters)
   separated by spaces.

   To ensure security, a valid passphrase must contain no
   duplicate words.

   For example:

     * aa bb cc dd ee is valid.
     * aa bb cc dd aa is not valid - the word aa appears more
       than once.
     * aa bb cc dd aaa is valid - aa and aaa count as different
       words.

   The system's full passphrase list is available as your
   puzzle input. How many passphrases are valid?

   Your puzzle answer was 466.

--- Part Two ---

   For added security, yet another system policy has been put
   in place. Now, a valid passphrase must contain no two words
   that are anagrams of each other - that is, a passphrase is
   invalid if any word's letters can be rearranged to form any
   other word in the passphrase.

   For example:

     * abcde fghij is a valid passphrase.
     * abcde xyz ecdab is not valid - the letters from the
       third word can be rearranged to form the first word.
     * a ab abc abd abf abj is a valid passphrase, because all
       letters need to be used when forming another word.
     * iiii oiii ooii oooi oooo is valid.
     * oiii ioii iioi iiio is not valid - any of these words
       can be rearranged to form any other word.

   Under this new system policy, how many passphrases are
   valid?

   Your puzzle answer was 251.

   Both parts of this puzzle are complete! They provide two
   gold stars: **

   At this point, you should return to your advent calendar and
   try another puzzle.

   If you still want to see it, you can get your puzzle input.

References

   Visible links
   . http://adventofcode.com/
   . http://adventofcode.com/2017/about
   . http://adventofcode.com/2017/support
   . http://adventofcode.com/2017/events
   . http://adventofcode.com/2017/settings
   . http://adventofcode.com/2017/auth/logout
   . http://adventofcode.com/2017
   . http://adventofcode.com/2017
   . http://adventofcode.com/2017/leaderboard
   . http://adventofcode.com/2017/stats
   . http://adventofcode.com/2017/sponsors
   . http://adventofcode.com/2017/sponsors
   . http://adventofcode.com/2017
   . http://adventofcode.com/2017/day/4/input