This is a set of three books: Z-Kai's Sokudoku Eitanngo (Rapid Reading English Vocabulary) - Advanced, Essential, and Introductory editions. The Essential and Advanced editions have some tears on the covers. Please check the images. There are some markings, such as checks and numbers, next to the vocabulary words. There are almost no markings in the main text. Please only purchase if you understand that these are used items. - Title: Sokudoku Eitanngo Introductory Edition (Revised 2nd Edition) - Title: Sokudoku Eitanngo Essential Edition (Revised 6th Edition) - Title: Sokudoku Eitanngo Advanced Edition (Revised 3rd Edition) Thank you for looking.