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Posted 20 November 2013 - 11:42 PM
I actually wanted an N x N grid but since the picture specifically references a grid, i just let the group go with that.
I think the first part has been suggested for any N.
But inserting the 3:1 condition is difficult when N is odd.
Perhaps a general solution exists for a 2p x 2p grid.
I'll think about that one.
- Bertrand Russell
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