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4 letter words:

muti6,

3 letter words:

bum7, mib7, big6, bug6, gib6, gub6, gum6, mig6, mug6, bit5, but5, mut5, tub5, tum5, git4, gut4, tig4, tug4, tui3,

2 letter words:

bi4, mi4, mu4, um4, gi3, gu3, ug3, it2, ti2, ut2,