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5 letter words:

exurb14,

4 letter words:

brux13, ibex13, beer6, bier6, bree6, brie6, rube6,

3 letter words:

rex10, bee5, bur5, reb5, rib5, rub5, urb5, ere3, ire3, ree3, rei3, rue3,

2 letter words:

ex9, xi9, xu9, be4, bi4, er2, re2,