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  <a href="./Chap1.html" class="sidebar-item-text sidebar-link"><span class="chapter-number">1</span>&nbsp; <span class="chapter-title">Sentential Logic</span></a>
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  <a href="./Chap2.html" class="sidebar-item-text sidebar-link active"><span class="chapter-number">2</span>&nbsp; <span class="chapter-title">Quantificational Logic</span></a>
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