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5 letter words:

cuber9,

4 letter words:

zebu15, cube8, curb8, crue6, cure6, ecru6, rube6,

3 letter words:

bez14, cuz14, rez12, cub7, bru5, bur5, cru5, cue5, cur5, ecu5, reb5, rec5, rub5, ruc5, urb5, rue3, ure3,

2 letter words:

be4, er2, re2, ur2,