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"Solving problems", wrote Polya, "is a practical art, like swimming, or skiing, or playing the You can learn it only by imitation and practice. This book cannot offer you a magic key that opens all the doors and solves all the problems, but it offers you good examples for imitation and many opportunities for If you wish to learn swimming you have to go into the water and if you wish to become a problem solver you have to solve problems."
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