ECH
| Date | Clue |
|---|---|
| 2016-03-05 | Level in an org. |
| 2013-03-08 | Command level: Abbr. |
| 2013-02-21 | Hierarchical level: Abbr. |
| 2012-09-07 | Command level: Abbr. |
| 2003-01-17 | Command level: Abbr. |
| 2002-09-26 | Command level: Abbr. |
| 2000-09-29 | Command level: Abbr. |
| 1997-02-01 | Level of hierarchy: Abbr. |