Enter a clue or pattern or both:
The Clue
Because, in Bonn (4 letter answer)
The Answer
WEIL
Tags
Notes
The answer WEIL is so rare that it appears less than once every 2500 puzzles.
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Definition
WEIL as a noun:
1. (Weil, Simone Weil) = French philosopher (1909-1943)
2. (Weil, Andre Weil) = United States mathematician (born in France) (1906-1998)