| Clue | Source | Date |
|---|---|---|
| It's very unlikely to happen | New York Times | 02 Jan 2023 |
| Major condition | LA Times Daily | 17 Aug 2021 |
| Major condition | The Washington Post | 17 Aug 2021 |
| It's a lot to assume | New York Times | 10 Mar 2021 |
| Fundamental question | Wall Street Journal | 17 Feb 2021 |
| Major uncertainty | New York Times | 29 Jul 2019 |
| Hard-to-meet condition | LA Times Daily | 17 Feb 2019 |
| Hard-to-meet condition | The Washington Post | 17 Feb 2019 |
| Hard-to-meet condition | ||
| Fundamental question | ||
| Major uncertainty | ||
| Significant qualification | New York Times | 06 Sep 2017 |
| Significant qualification | ||
| Huge condition | Wall Street Journal | 30 Apr 2016 |
| Problematic event | ||
| Unlikely but necessary condition |