第三部分由0开始，循环进位，直到进位满了之后再清零，重新开始计数。

The third part begins with 0, does end-round carry, clears when the carry is full and restarts counting.

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此外，如果讯息包含最佳化的二进位资料，它可能会包含其他具有二进位资料的MIME部分。

In addition, if the message contains binary data that is optimized, it may contain additional MIME parts that contain binary data.

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LUT的另一部分产生进位溢出位。

Another portion of the LUT generates carry-out bits.

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