Perform the operation and simplify the answer. 
Definitions:
Radial
Relating to, or situated near the radius or forearm; in a broader sense, spreading out in all directions from a common center.
Ulnar
Pertaining to the ulna, one of the two long bones in the forearm, or related to areas supplied by the ulnar nerve.
Brachiocephalic Artery
The brachiocephalic artery is a major blood vessel arising from the aortic arch that supplies blood to the right arm and the head and neck.
Left Common Carotid
A major artery in the neck that supplies blood to the head, neck, and brain.
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