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4 letter words:

bren6, burn6, rube6, unbe6, rune4,

3 letter words:

ben5, bru5, bun5, bur5, neb5, nub5, reb5, rub5, urb5, ern3, nur3, ren3, rue3, run3, ure3, urn3,

2 letter words:

be4, en2, er2, ne2, nu2, re2, un2, ur2,