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5 letter words:

ferms10,

4 letter words:

fems9, ferm9, refs7, serf7, rems6,

3 letter words:

fem8, efs6, erf6, fer6, fes6, ref6, ems5, mes5, rem5, ers3, res3, ser3,

2 letter words:

ef5, fe5, em4, me4, er2, es2, re2,