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5 letter words:

nairu5,

4 letter words:

airn4, rain4, rani4, raun4, ruin4, unai4,

3 letter words:

ain3, air3, ani3, nur3, rai3, ran3, ria3, rin3, run3, uni3, urn3,

2 letter words:

ai2, an2, ar2, in2, na2, nu2, un2, ur2,