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5 letter words:

bocks13,

4 letter words:

bock12, boks10, bosk10, kobs10, sock10, cobs8,

3 letter words:

bok9, kob9, cob7, kos7, bos5, cos5, obs5, sob5, soc5,

2 letter words:

ko6, bo4, ob4, os2, so2,