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1. sigma
noun.
(ˈsɪgmə)
The
18th
letter
of
the
Greek
alphabet.
Synonyms
Greek alphabet
alphabetic character
letter
letter of the alphabet
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challenge
creative
negative-impact
aesthetic
white-person
potential
solution
deep-understanding
assistance
pertinacity
for-the-first-time
detect
define
collywobbles
know-it-all
gujarati
help
happy
oppose
technology
atmosphere
mental-health
focus
empathy
invisible
homophobic
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center
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more-likely
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