454 series/series.15.p
Description
This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
454 series/series.15.p
A, E, F, H, I, ?
series/series.15.s
L, M, N, O, R, S, U, X. Letters whose English names start with vowels.
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