Find the following:
1) words with only one type of vowel, but at least 5 of them
2) words having all 6 vowels (A-E-I-O-U-Y) no longer than 12 letters
3) worse having all first 6 letters of the alphabet (A-B-C-D-E-F)
Words from http://www.infochimps.com/datasets/word-list-100000-official-crossword-words-excel-readable