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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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#separator, #first-child {
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height: 20px;
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background-color: green;
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}
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#spacer {
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height: 10px;
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}
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</style>
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</head>
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<body>
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<div id="separator"></div>
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<div id="spacer"></div>
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<div id="first-child"></div>
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</body>
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</html>
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