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6 letter words:

tussis6,

5 letter words:

sists5, situs5, suits5,

4 letter words:

siss4, sist4, sits4, suit4, suss4, tuis4, utis4,

3 letter words:

its3, sis3, sit3, sui3, sus3, tis3, tui3, uts3,

2 letter words:

is2, it2, si2, st2, ti2, us2, ut2,