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The book is designed for teachers and pupils who study informatics for "Program for specialised schools, gymnasiums, lyceums. Informatics and Programming for Schools and Liceums. 8-11 grades", recommended by the Ministry of Education and Science of Ukraine, and also will be useful for pupils of 10-11 grades of secondary schools, in preparation for Olympiads, tournaments, competitions, students of secondary specialised educational institutions and universities.