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The books of the "Propsy" series will help preschoolers prepare their hands for writing, train their fingers, develop elementary graphic and calligraphic skills, learn to perform tasks accurately, and navigate lines and cells, follow the given direction, slope and shape of lines, letters, numbers, shapes, form an eye for detail, develop the ability to complete tasks according to a pattern, and write individual elements of numbers and letters clearly, beautifully and accurately, connect letters to words, and shapes and lines to drawings.