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5 letter words:

focus10,

4 letter words:

foys10, cosy9, coys9, fusc9, fous7, ufos7, yous7,

3 letter words:

foy9, coy8, fou6, oys6, soy6, ufo6, yos6, you6, yus6, cos5, soc5, ous3, sou3,

2 letter words:

fy8, of5, oy5, yo5, yu5, os2, ou2, so2, us2,