Enter a clue or pattern or both:
The Clue
Publ. output (3 letter answer)
The Answer
BKS
Tags
Notes
The answer BKS is rarely seen, appearing only about once every 2400 puzzles.
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Definition
BK as a noun:
1. (berkelium, Bk, atomic number 97) = a radioactive transuranic element; discovered by bombarding americium with helium