[Illustration:
11 77 62 29
69 22 17 71
27 61 79 12
72 19 21 67 ]
It will be seen that in the arrangement given every number is different,
and all the columns, all the rows, and each of the two diagonals, add up
179, whether you turn the page upside down or not. The reader will notice
that I have not used the figures 3, 4, 5, 8, or 0.