MAINS
| Date | Clue |
|---|---|
| 2024-01-24 | Some water bearers |
| 2022-12-18 | Primary pipes |
| 2022-01-17 | Major pipes |
| 2020-10-12 | Important pipes |
| 2018-01-11 | Big pipes |
| 2016-08-31 | Major conduits |
| 2011-12-24 | Sewer parts |
| 2010-03-04 | Sewers have them |
| 2005-12-01 | Principal pipes |
| 2004-07-11 | Large pipes |
| 2003-07-03 | Underground conduits |
| 2003-04-24 | Principal pipes |
| 2002-12-08 | Big pipes |
| 2001-09-30 | Water conduits |
| 2001-08-12 | They may be full of gas |
| 2001-05-14 | Water pipes |
| 1997-03-16 | Pipelines |
| 1995-07-20 | Water pipes |
| 1995-04-01 | Water carriers |
| 1994-05-28 | Sewer connections |