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5 letter words:

borts7,

4 letter words:

bort6, bots6, bros6, orbs6, robs6, sorb6, stob6, orts4, rots4, sort4, tors4,

3 letter words:

bos5, bot5, bro5, orb5, rob5, sob5, ors3, ort3, rot3, sot3, tor3,

2 letter words:

bo4, or2, os2, so2, to2,