I don't know if the comparison of two words is direction dependent this mean compare word1 with word2 is the same as compare word2 to word1. If yes keep your algoritm if no follow chromatics tip and compare the first element to all elements in the arrays but the first one (the elements himself), then compare the second element to all other but first two because you already compared the first to a second. This what chromatic pointed to.

In reply to Re^3: Mysterious slow down with large data set by wwe
in thread Mysterious slow down with large data set by jsmagnuson

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