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<!-- Load the in-browser babel compiler.  Make sure page encoding is UTF-8. -->
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<!-- Set script type to text/babel for on-the-fly conversion and execution -->
<script type="text/babel" src="custom.js"></script>
<!-- Babel need to read the script through ajax, same origin policy applies. -->
MrRobot