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5 letter words:

brook11,

4 letter words:

boko10, book10, bork10, kobo10, koro8, rook8, boor6, broo6,

3 letter words:

bok9, kob9, kor7, rok7, boo5, bor5, bro5, obo5, orb5, rob5, oor3, roo3,

2 letter words:

ko6, bo4, ob4, oo2, or2,