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6 letter words:

twists9,

5 letter words:

twist8, twits8, wists8,

4 letter words:

twit7, wiss7, wist7, wits7, sits4, tits4,

3 letter words:

wis6, wit6, its3, sis3, sit3, tis3, tit3,

2 letter words:

is2, it2, si2, ti2,