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4 letter words:

dreg6, dern5, gren5, nerd5, rend5,

3 letter words:

deg5, ged5, den4, end4, eng4, erg4, gen4, ned4, neg4, red4, reg4, ern3, ren3,

2 letter words:

de3, ed3, en2, er2, ne2, re2,