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5 letter words:

yipes10,

4 letter words:

espy9, pyes9, yeps9, yipe9, yips9, pies6, sipe6,

3 letter words:

pye8, spy8, yep8, yip8, yes6, pes5, pie5, pis5, psi5, sip5, sei3,

2 letter words:

ye5, pe4, pi4, es2, is2, si2,