二阶布尔差分
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Second-order Boolean difference
以上为机器翻译结果，长、整句建议使用 人工翻译 。
二阶布尔差分通过两次变换产生新积项，并删除相同积项来得到。
The second-order Boolean difference was obtained by double transform operations to produce new product items, and the same product items were deleted.
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