There are 3 policemen and 3 thieves. They have to cross a river, but if the number of thieves is **greater than or equal to** the number of policemen, they will break free!

With only one boat, what is the fewest number of moves that must be made?

Note:

- A move is defined as one per person per trip across the river.
The thieves can travel alone on the boat, and can be left alone.

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