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数学问题 10 + 3 =

计算出这道简单的算术题并键入答案。例如、1+3,就输入 4。

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数学问题 12 + 6 =

计算出这道简单的算术题并键入答案。例如、1+3,就输入 4。

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

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