Complete 1 to 81 so the numbers follow a horizontal or vertical path -- no diagonals.

     

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Solution to the Problem:





Correctly solved by:

1. Rebecca Hayes Madison, Wisconsin
2. Emre Karabıyık Hacettepe University,
ANKARA, TURKEY
3. Ivy Joseph Pune, Maharashtra, India
4. Colin (Yowie) Bowey Beechworth, Victoria, Australia