| Clue | Source | Date |
|---|---|---|
| 'That's a sure bet' | New York Times | 15 May 2020 |
| 'There's no doubt about this' | The Washington Post | 19 Jan 2019 |
| "There's no doubt about this" | LA Times Daily | 19 Jan 2019 |
| "There's no doubt about this" | ||
| 'You can be sure!' | Thomas Joseph | 03 Apr 2017 |
| 'I promise you!' | The Chronicle of Higher Education | 01 Apr 2016 |
| "I promise you!" | ||
| *"That's a certainty!" | ||
| *"That's a certainty!" | ||
| "I won't let you down!" | ||
| "I won't let you down!" | ||
| Confident words |