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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Hurley, Patrick (1991). A Concise Introduction to Logic 4th edition. Wadsworth Publishing. p. 192. <a href="https://archive.org/details/studyguidetoacco00burc" target="_blank">https://archive.org/details/studyguidetoacco00burc</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Copi, Irving M.; Cohen, Carl (2005). Introduction to Logic. Prentice Hall. p. 189. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Parsons, Terence (2012). "The Traditional Square of Opposition". In Edward N. Zalta (ed.). The Stanford Encyclopedia of Philosophy (Fall 2012 ed.). 3-4. <a href="http://plato.stanford.edu/archives/fall2012/entries/square#IrrSyl" target="_blank">http://plato.stanford.edu/archives/fall2012/entries/square#IrrSyl</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>