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5 letter words:

penni7, unpen7, unpin7, ennui5,

4 letter words:

pein6, pine6, nine4,

3 letter words:

nip5, pen5, pie5, pin5, piu5, pun5, inn3, nun3,

2 letter words:

pe4, pi4, up4, en2, in2, ne2, nu2, un2,