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For example:
ska ske ski sko sku sky - three of six are real words.
bate bete bite bote bute byte - four of six are real words.
is there any pattern for which all six are real words?
Bunch of unsuccessful patterns tried here: http://heapershangout.com/index.php?p=/discussion/comment/466122#Comment_466122 (some came close though)
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If you don't count Y as a vowel: Pat, Pet, Pit, Pot, Put.
hap hep hip hop hup hyp
Most of those are really sketchy "words" but they're all in Wiktionary (for English).