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Earn at least 400 total score for at least 80 non-community wiki answers in the tag.
Awarded 4 times.
Awarded Sep 2 '18 at 4:06 to
Awarded Jan 20 '18 at 4:03 to
Awarded Mar 28 '17 at 11:24 to
Awarded Nov 8 '13 at 3:00 to
https://math.stackexchange.com/help/badges/346/propositional-calculus
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