INFRA
| Date | Clue |
|---|---|
| 2023-09-12 | Prefix with structure |
| 2022-06-19 | Range of light that's invisible to the human eye |
| 2021-03-22 | Prefix with red or structure |
| 2017-08-13 | Prefix with structure |
| 2014-02-23 | Red opening? |
| 2013-04-02 | Prefix with structure |
| 2013-02-17 | Prefix with red |
| 2011-05-22 | ___ dignitatem |
| 2011-01-20 | Prefix with sound |
| 2009-11-29 | Red leader? |
| 2009-10-07 | Prefix with red |
| 2007-08-02 | Prefix with structure |
| 2007-03-11 | Prefix with red |
| 2006-12-05 | Prefix with structure |
| 2006-11-22 | Prefix with red |
| 2006-06-04 | Red leader? |
| 2005-05-08 | Prefix with red |
| 2003-07-29 | Prefix with structure |
| 2002-04-14 | Prefix with structural |
| 2000-11-26 | Prefix with structure |
| 1999-05-17 | Prefix with red |
| 1999-05-09 | Prefix with red |
| 1998-05-19 | Prefix with structure |
| 1996-02-14 | Prefix with red |