INTR
| Date | Clue |
|---|---|
| 2016-10-03 | Like some verbs: Abbr. |
| 2012-10-27 | Like some verbs: Abbr. |
| 2009-08-30 | Like some verbs: Abbr. |
| 2008-10-18 | Preface: Abbr. |
| 2007-09-16 | Like some verbs: Abbr. |
| 2006-10-09 | Verb type: Abbr. |
| 2006-05-05 | Like 101 courses: Abbr. |
| 2003-10-26 | Like some verbs: Abbr. |
| 2002-12-25 | Like some verbs: Abbr. |
| 2002-11-19 | Foreword: Abbr. |
| 2002-07-02 | Verb type: Abbr. |
| 2001-07-04 | Foreword: Abbr. |
| 1995-01-29 | Verb type: Abbr. |