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5 letter words:

spits7,

4 letter words:

piss6, pits6, psis6, psst6, sips6, spit6, tips6, sist4, sits4,

3 letter words:

pis5, pit5, psi5, pst5, sip5, tip5, its3, sis3, sit3, tis3,

2 letter words:

pi4, is2, it2, si2, st2, ti2,