A perplexing problem…
A perplexing problem is how to get yourself, a fox, a chicken, and a bag of grain across a river. Your boat is only large enough to carry you and one of the others at any one crossing. Yet, if you leave the fox alone with the chicken he will devour it. And should you leave the chicken alone with the grain you would inevitably have to take both at once since the one would be inside the other. How can they all be taken safely across without any unwanted lunch stops during the process?
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First take the chickens across. Then the grain. Bring the chickens back and take the fox across. Next return for the chickens.
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