| Clue | Source | Date |
|---|---|---|
| Synchronous | Wall Street Journal | 18 May 2024 |
| Working harmoniously (with) | New York Times | 08 Nov 2018 |
| Working harmoniously (with) | ||
| Variegated ash and pine sharing a developmental stage | ||
| Synchronized | ||
| Synchronized, as mechanisms | ||
| Synchronized | ||
| Synchronized | ||
| Working synchronously | ||
| Synchronous | ||
| Synchronized | ||
| Synchronized | ||
| Synchronized. |