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p.ex1 {margin-right:4cm}
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<p>A paragraph with no margins specified. A paragraph with no margins specified. A paragraph with no margins specified.</p>
<p class="ex1">A paragraph with a 4cm right margin. A paragraph with a 4cm right margin. A paragraph with a 4cm right margin.</p>
<p>A paragraph with no margins specified. A paragraph with no margins specified. A paragraph with no margins specified.</p>
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