For students who study 1C Junior course.
Author: Ricardo Enriquez
Author: Aleksandr Biryukov
Author: Phan Hoàng Anh
Author: Vladimir Grinkevich
Author: Roberto Guerrero
Author: Alex Ogourok
Author: Mesut Kahraman
Author: Saygin Eroglu
Author: Konstantin Rupasov
Author: Hüseyin Karademir
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