A language learning reference book containing 1600 important words and 1000 important phrases. I only looked at the first few pages and haven't used it since, so it's almost new. There are a few check marks in the check boxes on the first few pages only. - Title: DUO 3.0 - Contents: Contains 1600 important words and 1000 important phrases - Price: 1200 yen - Features: A reference book specifically for language learning Thank you for looking.