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This is an interesting topic because refers to a well-known series of Russian math workbooks (primarily for elementary grades), created by N. B. Petakova (Наталья Борисовна Петакова).
This is an interesting topic because refers to a well-known series of Russian math workbooks (primarily for elementary grades), created by N. B. Petakova (Наталья Борисовна Петакова).