Enter a clue or pattern or both:
The Clue
Fraternity letters (5 letter answer)
The Answer
BETAS
Tags
Notes
The answer BETAS is uncommon, appearing about once every 475 puzzles.
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Followers of alphas
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Greek letters
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Radioactive rays
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Test versions
Buggy versions, maybe
Ones being tested
Prominent stars in constellations
Second-brightest stars
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Still-in-development apps
Bug-ridden software releases
They're not final releases
Definition
BETA as a noun:
1. the 2nd letter of the Greek alphabet
2. (Beta, genus Beta) = beets