A set of training books to cultivate logical thinking, written by Hiroshi Deguchi, consisting of the Basic, Applied, and Mastery editions. - Title: Hiroshi Deguchi's Japanese Logic Training - Author: Hiroshi Deguchi - Series Name: Logic Engine Jr. - Grade Level: First Grade Elementary School - Editions: Basic, Applied, Mastery - Publisher: Shogakukan - Content: Training books to cultivate logical thinking. No writing inside. Please understand that there may be some dirt and minor scratches on the cover, as the book was stored on a bookshelf with other books. The answer key has been detached.