On the outskirts of a kingdom, a patrol of 12 knights are riding to guard the border. About 10 minutes behind them is a patrol of 10 knights. The first patrol finds a pear tree with 12 pears on it. They are hungry. Each takes a pear and eats it. When the patrol of 10 knights comes, the captain eats 2 and the other 9 eat 1. How is this possible?
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