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Original code by Rick Osborne, 2006
... released under the Mozilla Public License v1.1
... with an algorithm translated from the C-Sharp source by Matthias Hertel
... which was originally released under the Creative Commins Attribution 2.0 Germany license
... and is based on a paper by Eugene Meyers
Algorithmica Vol. 1 No. 2, 1986, p 251: "An O(ND) Difference Algorithm and its Variations"
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