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An armorer of Chu boldly claims to make the best spears and shields.
"My shields are so strong; they cannot be penetrated by any weapon," he said.
A man asks, "If your spear is thrown at your shield, what then?" By logic, both an unpenetrable shield and an all-piercing spear can not exist at the same time.
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-State of Chu (841-233 b.c.),
Chou Dynasty