Where a step is a comparison or an arithmetic operation.

第一步肯定是比较，或者进行某种算法的操作。

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For a comparison operation, exactly two operands must be supplied.

对于比较运算，必须正好提供两个操作数。

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For a comparison operation, exactly two operands must be supplied.

对于比较运算，必须正好提供两个操作数。

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