With the 30-year quest for AEIOU words now behind us, I have taken the opportunity to add the letter Y and repeat the exercise for AEIOUY words. Y acts as a vowel in words such as symbol and is referred to variously as the sixth vowel, a semi-vowel or a secondary vowel. The world of AEIOUY words, those in which the six vowels A, E, I, O, U, and Y each occur just once, takes us into largely unexplored territory. There are 720 permutations of the six vowels A, E, I , O , U, and Y, six times as many as for A, E, I, O, and U.
Word Ways: Vol. 33
, Article 3.
Available at: http://digitalcommons.butler.edu/wordways/vol33/iss3/3