NULLS
| Date | Clue |
|---|---|
| 2025-02-10 | Makes void |
| 2017-03-07 | Makes void |
| 2016-12-11 | Dummy symbols in ciphers |
| 2015-06-20 | Zeroes |
| 2011-12-04 | Sets to zero |
| 2002-11-07 | Repeals |
| 2000-07-27 | Cancels |
| Date | Clue |
|---|---|
| 2025-02-10 | Makes void |
| 2017-03-07 | Makes void |
| 2016-12-11 | Dummy symbols in ciphers |
| 2015-06-20 | Zeroes |
| 2011-12-04 | Sets to zero |
| 2002-11-07 | Repeals |
| 2000-07-27 | Cancels |