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5 letter words:

kufis12,

4 letter words:

kifs11, kufi11, kois8, souk8,

3 letter words:

kif10, kis7, koi7, kos7, ski7, suk7, fou6, ifs6, sou3,

2 letter words:

ki6, if5, of5, is2, oi2, os2, si2, so2, us2,