There are three cannibals and three missionaries at the edge of a river. There is a small raft which can carry only two people. If, at any time, there are more cannibals than missionaries on either side of the river, the cannibals will gang up and eat the missionaries. (Staying in the boat is not an option; if the boat is on one side of the river, so is anyone in the boat.) How do they cross the river without anyone being eaten?
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