x
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<html>
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<head>
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<style>
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ul
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{
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list-style-image: url('https://www.closetag.com/images/square.png');
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}
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</style>
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</head>
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<body>
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<ul>
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<li>HTML</li>
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<li>CSS</li>
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<li>PHP</li>
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</ul>
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</body>
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</html>