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4 letter words:

fums9,

3 letter words:

fix13, mix12, mux12, six10, xis10, fum8, ifs6, sif6, ism5, mis5, mus5, sim5, sum5, sui3,

2 letter words:

xi9, xu9, if5, mi4, mu4, um4, is2, si2, us2,