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Walsh permutation; bit permutation; calc
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Finite permutations ''p'' and corresponding bit permutations ''P'' are composed in opposite directions:


<math>p_a * p_b * ... = p_x ~~~~ \Leftrightarrow ~~~~ ... * P_b * P_a = P_x</math>
(contracted; show full)    15
%      The result is P22.
%      P8 before P3 before P1 = P22
</source>


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[[Category:Walsh permutation]]
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