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5 letter words:

mimsy12, mumsy12,

4 letter words:

sizy16, immy11, sumy9, mums8,

3 letter words:

miz14, yum8, mim7, mum7, umm7, yus6, ism5, mis5, mus5, sim5, sum5, sui3,

2 letter words:

my7, mm6, yu5, mi4, mu4, um4, is2, si2, us2,