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May 26, 2015 at 22:05 vote accept Laura
May 23, 2015 at 5:43 answer added ubpdqn timeline score: 2
May 23, 2015 at 3:47 history edited J. M.'s missing motivation CC BY-SA 3.0
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May 22, 2015 at 22:11 answer added kglr timeline score: 1
May 22, 2015 at 21:42 comment added JimB One possibility might be to sum over all combinations of $i$ and $j$ and then subtract out the combinations where $i=j$. This might not be the most machine efficient approach but if you only have 4*4 combinations to look at, it won't matter.
May 22, 2015 at 21:38 answer added Basheer Algohi timeline score: 1
May 22, 2015 at 21:31 history asked Laura CC BY-SA 3.0