| Clue | Source | Date |
|---|---|---|
| Much-debated punctuation mark | Wall Street Journal | 25 Nov 2019 |
| Controversial bit of punctuation | Newsday | 06 Oct 2019 |
| Style-guide subject, often | The New Yorker | 26 Aug 2019 |
| Cause of grammarians' separation anxiety | Newsday | 07 May 2016 |
| Much-debated grammar subject | New York Times | 29 Aug 2015 |
| Much-debated grammar subject |