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5 letter words:

courb9,

4 letter words:

zobu15, curb8, cour6,

3 letter words:

coz14, cuz14, cob7, cub7, bor5, bro5, bru5, bur5, cor5, cru5, cur5, orb5, orc5, rob5, roc5, rub5, ruc5, urb5, our3,

2 letter words:

zo11, bo4, ob4, or2, ou2, ur2,