James thought that the desk was built with solidity, but when he rapped on it he could hear what?\nOptions:\n- openness\n- instability\n- hollowness\n- strange sounds\n- weakness
Let's think carefully first. Step-by-step reasoning process:
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James thought that the desk was built with solidity, but when he rapped on it he could hear hollowness. So the final answer is hollowness.
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