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6 letter words:

oppugn11, popgun11,

4 letter words:

pong7, pung7, upgo7, noup6, upon6,

3 letter words:

pop7, pup7, gup6, pug6, oup5, pun5, upo5, gnu4, gon4, gun4, nog4,

2 letter words:

op4, po4, up4, go3, gu3, ug3, no2, nu2, on2, ou2, un2,