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6 letter words:

ippons10,

5 letter words:

ippon9, opsin7, pions7, psion7,

4 letter words:

pips8, pops8, nips6, pins6, pion6, piso6, pois6, pons6, snip6, spin6, ions4,

3 letter words:

pip7, pop7, nip5, ops5, pin5, pis5, poi5, pos5, psi5, sip5, sop5, ins3, ion3, ios3, iso3, nis3, nos3, ons3, sin3, son3,

2 letter words:

op4, pi4, po4, in2, io2, is2, no2, oi2, on2, os2, si2, so2,