Revision as of 23:18, 11 May 2012 edit Helpful Pixie Bot (talk \| contribs) Bots 571,497 edits m ISBNs (Build KH) ← Previous edit		Revision as of 03:10, 22 October 2012 edit undo Gregbard (talk \| contribs) Extended confirmed users, Pending changes reviewers 90,738 edits removed Category:Necessity and sufficiency using HotCat Next edit →
Line 54: [[Category:Propositional calculus]] [[Category:Modal logic]] ~~[[Category:Necessity and sufficiency]]~~ [[Category:Logical connectives]]

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