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This is famous puzzle that I can came across recently. Place six points on a plane so that distance between any two points is integer such that no three points are collinear.

In 3D it is easy( pyramid) but how to do this in case of 2D?

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    Do the distances need to be different? It makes a huge difference. If not, it is easy to find as many as you want.2013-01-14

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