PROBLEM 6

Colour the squares of a 6 x 6 checkerboard black and white in thefollowing way:
Each square must have an odd number of black neighbours (where a neighbour is asquare that is adjacent either vertically or horizontally.)

Send your solutions to David Poole, Department of Mathematics, LEC N127-2 or bye-mail to madgp@blaze.trentu.ca.
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