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4 letter words:

feis7, safe7, seif7,

3 letter words:

efs6, fae6, fas6, fes6, fie6, ifs6, sif6, ais3, eas3, sae3, sai3, sea3, sei3,

2 letter words:

ef5, fa5, fe5, if5, ae2, ai2, as2, ea2, es2, is2, si2,