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082 _aBb4, K2.1 K2.2 K2.1;1 K2.2;1
100 _aPolya G
245 0 _aMathematical on understanding learning and teaching problem solving discovery
260 _c1962
300 _ap.
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650 _aMathematics
942 _hBb4, K2.1 K2.2 K2.1;1 K2.2;1
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999 _c79369
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