This is the "Logic Engine Series" developed by Hiroshi Deguchi, a "charismatic modern Japanese instructor" and a "leading figure in logical education." The explanations are easy to understand, and the commentary in the answers, in particular, enhances the value of this text. This is a suitable text for improving "logical thinking skills." This book includes logical writing, the basics of debate, and material-based questions. You can print out the check tests from the CD-ROM. 4① to 6② → "Practice Problems," no writing in the example problem "Answer Columns." There are faint pencil lines on the explanation pages, but they have been erased with an eraser (they are barely noticeable). Shipping will be via Yu-Yu Mercari or Rakuraku Mercari. Please understand that there may be minor scratches and scuffs due to being stored by a private individual. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Also, I am selling the following: ◉Textbook 1 and Workbook 1 (for elementary school 5th graders / Eiken Grade 5) ◉Textbook 2 and Workbook 2 (for elementary school 6th graders / Eiken Grade 4) as well as the elementary school English vocabulary book ◉vocabulary GRIT 750. Also, ◉Gakken Elementary School English Drill 2 and 3 are also on sale. #hiroko_elementary school materials (←linked to the sales page) Elementary school 3rd to 6th grade 【Math】text ◉Original text 【for cram schools】 is also on sale #hiroko_elementary school materials I am also selling "Junior High School Materials," "University Entrance Exam Materials," "Mathematics for University Entrance Exams," and "Dictionaries." ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A set of learning materials for developing logical thinking. Elementary School Japanese Language Materials - Set Contents: Logic Engine Level 6-1, Level 6-2, Level 5-1, Level 5-2, Level 4-1, Level 4-2, with CD - Number of pages: Practice problems with multiple pages in each booklet - Language used: Japanese - Target age: For elementary school students - Material type: Study guide Thank you for viewing.