A six-pointed star is drawn with six lines and twelve vertices. Arrange the integers 1 through 12, one on each vertex, so that the four integers on each line add to 26.
An example is given below but the numbers are wrong.
The left-hand vertical line adds up correctly: 1+2+12+11=26, but the line 9+2+10+7=28 does not.
FYI: Although this problem may appear simple at first, the solution is actually fairly complex.
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