VARIABLE
| Date | Clue |
|---|---|
| 2023-09-14 | Unknown quantity in a 10-Down |
| 2019-10-08 | The "x" or "y" in 2x + 3y = 15 |
| 2019-09-07 | Not fixed |
| 2011-08-11 | In the answers to 17-, 34- and 57-Across, it was replaced in turn by 1, 2, 3, 4, 5 ... |
| 2000-08-16 | Like some manufacturing costs |
| 1995-10-14 | Something not to be relied on |