# of, to, in, it, is, be, as, at, so, we, he, by, or, on, do, if, me, my, up, an, go, no, us, am.

two_letter_words = ["of", "to", "in", "it", "is", "be", "as", "at", "so", "we", "he", "by", "or", "on", "do", "if", "me", "my", "up", "an", "go", "no", "us", "am"]