Galen of Pergamon was a physician, surgeon, and philosopher. That's three things. A common tool of the surgeon is the scalpel. Art pencils are often sharpened with knives. The number or sides on a pencil is commonly six.
Six divided by three, the number of things Galen of Pergamon was, is two. Two plus a #2 pencil minus the number of erasers on that pencil divided by the number of metal bands on the pencil is three. A triangle has three sides. Galen is the eye triangle pencil.
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