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6 letter words:

ossify12,

4 letter words:

foys10, foss7, soys7, isos4,

3 letter words:

foy9, ifs6, oys6, sif6, soy6, yos6, ios3, iso3, sis3, sos3,

2 letter words:

fy8, if5, of5, oy5, yo5, io2, is2, oi2, os2, si2, so2,