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4 letter words:

zips15, kips10, kops10, skip10, spik10, kois8, piso6, pois6,

3 letter words:

zip14, kip9, kop9, kis7, koi7, kos7, ski7, ops5, pis5, poi5, psi5, sip5, sop5,

2 letter words:

ki6, op4, pi4, is2, oi2, os2, si2, so2,