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This book is a continuation of the "Planet of Reasoning" series of thinking development guides. Like the two previous books, it is designed to develop the productive thinking of primary school students. The book includes interesting, well-illustrated tasks and exercises that stimulate and develop logical, visual and schematic, heuristic, combinatorial thinking, as well as ingenuity, spatial imagination, memory, attention, and volitional qualities of students. The manual can be used during lessons, optional and extracurricular activities at school, independent work of students at home, and leisure activities. For primary school students, teachers, methodologists, students, parents.