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Dictionary

e'ven permuta'tion

Math.
a permutation of a set of n elements, x₁, x₂, … x_n, that leaves unchanged the product of all differences of the form (x_i — x_j), where i is less than j. Cf. odd permutation.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

even money

evensong

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