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7 letter words:

birkier13,

6 letter words:

birkie12, ribier8,

5 letter words:

biker11, bikie11, kibei11, kirri9, reiki9, brier7,

4 letter words:

berk10, bike10, birk10, brik10, kerb10, kibe10, keir8, kier8, reik8, bier6, birr6, brei6, brer6, brie6,

3 letter words:

keb9, eik7, erk7, irk7, kir7, brr5, reb5, rib5, err3, ire3, rei3,

2 letter words:

ki6, be4, bi4, er2, re2,