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4 letter words:

genu5, grue5, rung5, urge5, rune4,

3 letter words:

jug11, jeu10, jun10, guv7, veg7, vug7, rev6, eng4, erg4, gen4, gnu4, gun4, neg4, reg4, rug4, ern3, rue3, run3, urn3,

2 letter words:

en2, er2, ne2, nu2, re2, un2,