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6 letter words:

upsize17,

4 letter words:

zeps15, zips15, size13, pies6, sipe6, spue6, supe6,

3 letter words:

zep14, zip14, pes5, pie5, pis5, piu5, psi5, pus5, sip5, sup5, ups5, sei3, sue3, use3,

2 letter words:

pe4, pi4, up4, es2, is2, si2, us2,