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'Snails' Trails' printed from http://nrich.maths.org/
Alice and Brian are snails. They live on a wall. Alice at A and
Brian at B. They can only travel along the cement cracks. The
bricks are too rough for them.
Alice wants to visit Brian.
How far is the shortest route along the cracks?
Is there more than one way to go?
What is the longest route without going along any crack