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The cards will help you to develop attention, perception, logical and creative thinking, memory, intelligence, and the interaction of the two hemispheres in a playful way. All exercises have several levels of difficulty - this is what stimulates brain functions to develop. The exercises are suitable for all ages. They help schoolchildren to increase their ability to self-development and self-control, while older people intensify their thought processes, improve the stability of attention and memory, and sharpness of thinking, which contributes to health and longevity.