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5 letter words:

ippon9, pinup9,

4 letter words:

noup6, pion6, upon6,

3 letter words:

pip7, pop7, pup7, nip5, oup5, pin5, piu5, poi5, pun5, upo5, ion3, uni3,

2 letter words:

op4, pi4, po4, up4, in2, io2, no2, nu2, oi2, on2, ou2, un2,