OHI
Set to 4 different clues across 4 published puzzles, most often "___ don't know" — The New York Times, Friday, 24 December 2010.
3 letters
Every clue on record, most used first
- "___ don't know"once
The New York Times — Friday, 24 December 2010
- "___ don't know about that"once
The New York Times — Thursday, 13 May 2010
- "___ get it!"once
The New York Times — Saturday, 7 January 2006
- "___ get it!" ("Aha!")once
The New York Times — Wednesday, 12 August 1998