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以下为引用的内容：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>runcode</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="Author" content="Sheneyan" /> www~phperz~.com
</head>
<body>
<select>
<optgroup label="a">
<option>a1</option>
<option>a2</option>
<option>a3</option>
</optgroup> www phperz com
www.phperz.com
<optgroup label="b">
<option>b1</option>
<option>b2</option>
<option>b3</option>
</optgroup>
</select>
</body>
</html>
phperz.com
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