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5 letter words:

yetis8,

4 letter words:

stey7, stye7, tyes7, yeti7, site4, ties4,

3 letter words:

sty6, tye6, yes6, yet6, its3, sei3, set3, sit3, tie3, tis3,

2 letter words:

ye5, es2, et2, is2, it2, si2, ti2,