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5 letter words:

rutin5,

4 letter words:

inti4, nurr4, ruin4, runt4, ruru4, tirr4, trin4, turn4, unit4,

3 letter words:

nit3, nur3, nut3, rin3, rit3, run3, rut3, tin3, tui3, tun3, uni3, urn3, utu3,

2 letter words:

in2, it2, nu2, ti2, un2, ur2, ut2,