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5 letter words:

commy14,

4 letter words:

cozy18, juco13, mumu8,

3 letter words:

coz14, joy13, myc10, coy8, yom8, yum8, cum7, moc7, mom7, mum7, umm7, you6,

2 letter words:

jo9, my7, mm6, oy5, yo5, mo4, mu4, om4, um4,