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4 letter words:

cows9, scow9, iwis7, woos7, coos6,

3 letter words:

cow8, iwi6, sow6, wis6, woo6, wos6, wus6, cis5, coo5, cos5, sic5, soc5, ios3, iso3, oos3, ous3, sou3, sui3,

2 letter words:

ow5, wo5, io2, is2, oi2, oo2, os2, ou2, si2, so2, us2,