| Clue | Source | Date |
|---|---|---|
| It uses only 1s and 0s | Universal | 06 Dec 2023 |
| Braille is one | The Washington Post | 21 Jul 2021 |
| Braille is one | LA Times Daily | 21 Jul 2021 |
| *System with only ones and zeros | LA Times Daily | 07 May 2019 |
| *System with only ones and zeros | The Washington Post | 07 May 2019 |
| *System with only ones and zeros |