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5 letter words:

focus10, conus7, uncos7,

4 letter words:

fons7, funs7, cons6, unco6, nous4, onus4,

3 letter words:

fon6, fou6, fun6, con5, cos5, nos3, nus3, ons3, son3, sou3, sun3, uns3,

2 letter words:

of5, no2, nu2, on2, os2, so2, un2, us2,