Эвристика. Математика 6 лет
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![[RU] Эвристика. Творческие задачи и их решение. Георгий Незабитовский](https://sun9-15.userapi.com/XeY-iOHF02wfyNSSKvgDdNcaEz9oP96fI21Tmw/bEFXq6GlP-M.jpg)
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