Puzzle: Go round in circles to find the constant

Puzzle for 15 April 2008.

Puzzle: 15 April 2008Your task here is to take the consecutive series 1 to 19 and place one number in each circle in such a way that each of the 12 rows of three numbers (six round the perimeter and six radiating outwards from the centre) sums to a constant of 22. The problem is quite difficult, so I have already positioned the central 2 correctly.

See the answer to go round in circles to find the constant.

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