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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/esl.js"></script>
        <script src="lib/config.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                /* background-image: url(old_mathematics.png); */
                /* background-repeat: repeat; */
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        </style>
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                        levels: []
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        </script>
    </body>
</html>