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5 letter words:

kirby14,

4 letter words:

yirk11, bilk10, birk10, brik10, byrl9, lirk8, birl6,

3 letter words:

biz14, riz12, ilk7, irk7, kir7, lib5, rib5,

2 letter words:

ky9, by7, ki6, bi4, li2,