We know that using the numbers from 1 to 25 (once each), we can build a magic square of order 5, being 65 the magic constant.
Your task is to build a magic square of order 5, using only the numbers from 1 to 20 (once each), leaving one cell empty in each row, in each column, in each main diagonal.
Obviously, the magic constant will be [(1 + 20)/2]*20/5 = 42.
Note: This type of magic square has a name.
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