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4 letter words:

trez13, zest13, errs4, erst4, rest4, rets4, serr4, tres4,

3 letter words:

rez12, sez12, err3, ers3, est3, res3, ret3, ser3, set3, tes3,

2 letter words:

er2, es2, et2, re2, st2, te2,