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6 letter words:

inpour8,

5 letter words:

orpin7, prion7, purin7, unrip7,

4 letter words:

pion6, pirn6, porn6, pour6, puri6, roup6, upon6, inro4, iron4, noir4, nori4, ruin4,

3 letter words:

nip5, pin5, piu5, poi5, pro5, pun5, pur5, rip5, upo5, urp5, ion3, nor3, our3, rin3, run3, urn3,

2 letter words:

op4, pi4, up4, in2, no2, nu2, oi2, on2, or2, un2,