This is the toughest number net on our site! It has nineteen circles that have to be filled with the numbers 1 upto (and including) 19. These numbers have to be placed in such a way that all numbers on any horizontal row and any diagonal line add up to the same sum.
Warning: there are many horizontal and diagonal lines, which have a different number of circles (3, 4, or 5), nevertheless all these sums have to be equal!
How should the nineteen numbers be placed in the net?
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