> p result = ['a', 'e', 'i', 'o', 'u', 'y'].find_all{ |c| words.all?{ |word|
> word.index c } }
> result =[ c for c in ('a', 'e', 'i', 'o', 'u', 'y')
> if all(c in word for word in words)]
> Что больше на английский похоже?

PHP.

$in = 'fuckthemall aeouy yeah'; $letters = array('a','e','i','j','o','u','y');
foreach (str_word_count($in, 1) as $word) $letters = array_intersect($letters, str_split(count_chars($word, 3), 1));