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6 letter words:

youpon11,

5 letter words:

poyou10, yupon10,

4 letter words:

pony9, puny9, poon6, upon6,

3 letter words:

yup8, yon6, you6, poo5, pun5, upo5, noo3, ono3,

2 letter words:

oy5, yo5, op4, up4, no2, nu2, on2, un2,