| Clue | Source | Date |
|---|---|---|
| "Might be able to help" | LA Times Daily | 24 Oct 2019 |
| 'Might be able to help' | The Washington Post | 24 Oct 2019 |
| "Might be able to help" | ||
| Optimist's mantra | New York Times | 01 Jul 2017 |
| Optimist's mantra | ||
| "The Little Engine That Could" mantra | USA Today | 15 Apr 2016 |
| Mantra of the Little Engine That Could | New York Times | 22 Dec 2015 |
| Mantra of the Little Engine That Could |