Takashi Saito "Intelligence is the Ability to Explain" 1000 yen "New Academic Ability" 820 yen "Life is More Interesting from the Second Time Around" 990 yen These three books are being sold as a set. The content is useful for business and education. * "New Academic Ability" has about 10 pages with folds and markings. There are no other noticeable stains, but please understand that these items have been stored by a private individual. No pets, no smokers. Thank you for looking.