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# Nim

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**Nim** is a simple game used for examples in combinatorial game theory. The rules of nim are simple:

- The game begins with some piles of counters.
- Players alternate turns.
- On a turn, a player takes counters from a pile. At least one counter must be taken. All counters must be in the same pile.
- If a player cannot take a counter, that player loses.

There is a simple mathematical strategy to play the game perfectly. If both players play perfectly, the winner is determined by the initial setup.