ALGEBRA
Set to 4 different clues across 5 published puzzles, most often “Search for the unknown?” — The New York Times, Tuesday, 18 November 1997.
7 letters
Every clue on record, most used first
- Search for the unknown?2 times
The New York Times — Tuesday, 18 November 1997
- Field of unknowns?once
The New York Times — Wednesday, 20 June 2007
- Quadratics and suchonce
The New York Times — Sunday, 4 March 2001
- Search for xonce
The New York Times — Sunday, 27 July 1997