Fig. 1 (IMAGE) Osaka University Caption Example of implicit confirmation: 1. Predict category of unknown word. 2. Generate implicit confirmation request with category c. 3. Determine if the category c is correct from user response. Credit Osaka University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.