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The Cognitive series is a cardboard book for preschoolers to learn letters and numbers for the first time. Each of the books has its own peculiarities. In the ABC book, the child will not only learn the letters, but will also look at the colourful pictures very carefully, as each page of the book has questions for wit or observation. Their development is no less important than learning the alphabet. Especially for parents, the cards have a QR code. It contains tips on how to work with the book to help your child learn letters better.