usage: ./countdown [options] <letters>
options:
-d, --dict string Location of dictionary file (default "words.txt")
-h, --help Prints this message
-s, --max-size int Maximum size of word list
-l, --min-length int Minimum length answers need to be (default 1)
examples:
$ ./countdown 'sraneimax'
$ ./countdown --max-size 10 'mhseoudma'
$ ./countdown --dict /usr/share/dict/words --min-length 4 'eoiadnnzt'
Includes a sorted list of the top 1000 words in English in words.txt.