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4 letter words:

kuzu17, zerk17, kuru8, grue5, guru5, urge5,

3 letter words:

zuz21, zek16, rez12, keg8, erk7, euk7, kue7, uke7, erg4, gue4, gur4, reg4, rug4, rue3, ure3,

2 letter words:

gu3, ug3, er2, re2, ur2,