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text-align: center;
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margin-bottom: 0em;
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text-align: center;
margin-top: 8em;
margin-bottom: 2em;
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#openbook-html .page-html .chap-num{
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text-align: center;
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text-align: center;
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margin-bottom: 0.5em;
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#openbook-html .page-html a{
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#openbook-html .page-html .box0{
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#openbook-html .page-html .hangol1{
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