| Clue | Source | Date |
|---|---|---|
| Awfully cute Irish way to learn | ||
| Encouraging discovery, this cure I developed | ||
| Of experimentation | Newsday | 13 Sep 2020 |
| The obscenely rich use it as a rule of thumb, perhaps | ||
| Method of solving | New York Times | 27 Oct 2018 |
| Method of solving | ||
| Serving to make a point | ||
| Leading to discovery |