REQD
Set to 3 different clues across 4 published puzzles, most often “Necessary: Abbr.” — The New York Times, Tuesday, 6 October 2009.
4 letters
Every clue on record, most used first
- Necessary: Abbr.2 times
The New York Times — Tuesday, 6 October 2009
- Not optional: Abbr.once
The New York Times — Sunday, 19 April 2009
- Not opt.once
The New York Times — Wednesday, 22 December 2004