x
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<html>
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<head>
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<style>
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p
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{
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float: left;
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border:red solid 1px;
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}
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.clear
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{
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clear:left;
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}
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</style>
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</head>
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<body>
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<p>Paragraph 1</p>
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<p>Paragraph 2</p>
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<p>Paragraph 3</p>
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<p class="clear">Paragraph 4</p>
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</body>
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</html>