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5 letter words:

combo11, coomb11,

4 letter words:

womb11, comb10, boom8, coom8,

3 letter words:

cwm10, wow9, bow8, cow8, mow8, cob7, mob7, moc7, woo6, boo5, coo5, moo5, obo5, oom5,

2 letter words:

ow5, wo5, bo4, mo4, ob4, om4, oo2,