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'Torus Patterns' printed from http://nrich.maths.org/
An insight to this problem will most likely be gained by physically
trying to colour in various regions of the squares on paper, where
you can get a feel for how everything fits together.
Start by working out which parts of the squares are
connected together. If you colour one region of the square, you
will see that the colours of certain other regions of the square
immediately follow by considering connected parts of the