| Clue | Source | Date |
|---|---|---|
| Accumulation after many oil changes? | The Washington Post | 11 Oct 2020 |
| Accumulation after many oil changes? | LA Times Daily | 11 Oct 2020 |
| The dentist sorted all the bristled instruments into .. | New York Times | 04 Jan 2017 |
| The dentist sorted all the bristled instruments into ... |