Generating half of all permutations by never generating a permutation and its reverse?

产生一半的排列从不生成排列及其逆转?。

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The data compressing method based on constant grade makes use of permutation and combination theory.

常数级压缩方法利用排列组合原理，适于压缩字节内容无规律的文件。

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By introducing the original permutation and the region, the conception of single permutation is proposed.

在引入原排列和区的概念的基础上，提出了单排列的概念。

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I'll just mention that on the mantelpiece in her bedroom reside Boston Terrier tchotchkes of every pose and permutation.

WSJ: At 88, a World Full of Wonders

In 1926 South Beach was flattened by the most destructive hurricane in American history, and the subsequent building boom celebrated every permutation of Art Deco, from Streamline Moderne to Mediterranean.

BBC: A perfect day in Miami

Throughout every permutation that I ran, the tuition variable had a statistically significant and negative effect on partying, meaning that as students pay more in tuition, they are less apt to go out and party.

FORBES: Play Hard, Work Little: Life on America's College Campuses