TK
Reverted edits by CPVandaIism (Talk) to last revision by DerekE
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CPVandaIism
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DerekE
Undo revision 774599 by RichieHZ (Talk) Vandalism
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RichieHZ
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Foxtrot
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CherryS
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New page: ''Iff'' is an abbreviation used in mathematics for "if and only if" or ''logical equivalence''.
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