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Level 15 - ORARUHB
The answer to this puzzle is:
Words: ARBOUR, ARBOR, BURRO, ABHOR, BORA, BURR, ROAR, HOAR, BUHR, BURA, HORA, OAR, ARB, RAH, HOB, BOA, BRO, BAH, OUR, RHO
Bonus words:
ARBOUR, ARBOR, BURRO, ABHOR, BORA, BURR, ROAR, HOAR, BUHR, BURA, HORA, OAR, ARB, RAH, HOB, BOA, BRO, BAH, OUR, RHO