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5 letter words:

probs9,

4 letter words:

bops8, prob8, bors6, bros6, orbs6, pros6, robs6, sorb6,

3 letter words:

bop7, bor5, bos5, bro5, obs5, ops5, orb5, pos5, pro5, rob5, sob5, sop5, ors3,

2 letter words:

bo4, ob4, op4, po4, or2, os2, so2,