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5 letter words:

purge8,

4 letter words:

puer6, pure6, grue5, urge5,

3 letter words:

gup6, peg6, pug6, per5, pre5, pur5, rep5, urp5, erg4, gue4, gur4, reg4, rug4, rue3, ure3,

2 letter words:

pe4, up4, gu3, ug3, er2, re2, ur2,