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|  | * [http://mywikibiz.com/Peirce's_law Peirce's Law], [http://mywikibiz.com/ MyWikiBiz] |  | * [http://mywikibiz.com/Peirce's_law Peirce's Law], [http://mywikibiz.com/ MyWikiBiz] | 
|  | * [http://beta.wikiversity.org/wiki/Peirce's_law Peirce's Law], [http://beta.wikiversity.org/ Beta Wikiversity] |  | * [http://beta.wikiversity.org/wiki/Peirce's_law Peirce's Law], [http://beta.wikiversity.org/ Beta Wikiversity] | 
|  | + | * [http://www.netknowledge.org/wiki/Peirce's_law Peirce's Law], [http://www.netknowledge.org/ NetKnowledge] | 
|  | * [http://planetmath.org/encyclopedia/PeircesLaw.html Peirce's Law], [http://planetmath.org/ PlanetMath] |  | * [http://planetmath.org/encyclopedia/PeircesLaw.html Peirce's Law], [http://planetmath.org/ PlanetMath] | 
|  | + | * [http://www.proofwiki.org/wiki/Peirce's_Law Peirce's Law], [http://www.proofwiki.org/ ProofWiki] | 
|  | {{col-break}} |  | {{col-break}} | 
| − | * [http://www.proofwiki.org/wiki/Peirce's_Law Peirce's Law], [http://www.proofwiki.org/ ProofWiki]
 |  | 
|  | * [http://knol.google.com/k/jon-awbrey/peirce-s-law/3fkwvf69kridz/10 Peirce's Law], [http://knol.google.com/ Google Knol] |  | * [http://knol.google.com/k/jon-awbrey/peirce-s-law/3fkwvf69kridz/10 Peirce's Law], [http://knol.google.com/ Google Knol] | 
|  | * [http://www.getwiki.net/-Peirce%92s_Law Peirce's Law], [http://www.getwiki.net/ GetWiki] |  | * [http://www.getwiki.net/-Peirce%92s_Law Peirce's Law], [http://www.getwiki.net/ GetWiki] | 
| − | {{col-break}}
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|  | * [http://www.wikinfo.org/index.php?title=Peirce%92s_law&oldid=29173 Peirce's Law], [http://www.wikinfo.org/ Wikinfo] |  | * [http://www.wikinfo.org/index.php?title=Peirce%92s_law&oldid=29173 Peirce's Law], [http://www.wikinfo.org/ Wikinfo] | 
|  | * [http://www.textop.org/wiki/index.php?title=Peirce's_law Peirce's Law], [http://www.textop.org/wiki/ Textop Wiki] |  | * [http://www.textop.org/wiki/index.php?title=Peirce's_law Peirce's Law], [http://www.textop.org/wiki/ Textop Wiki] |