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7 letter words:

wistiti10,

5 letter words:

twist8, twits8, titis5,

4 letter words:

iwis7, twit7, wist7, wits7, isit4, titi4, tits4,

3 letter words:

iwi6, wis6, wit6, its3, sit3, tis3, tit3,

2 letter words:

is2, it2, si2, st2, ti2,