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HTML

<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="lib/codemirror.css">
<script src="lib/codemirror.js"></script>
<script src="addon/mode/simple.js"></script>
<meta charset="UTF-8">
<title>Title</title>
<style>
#cm {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
</style>
</head>
<body>
<textarea id="cm">
// this is a comment
routes[a2, min_cost(cost_pair)] := [a airport.iata 'LHR'], :flies_to[a, a2, dist],
[a2 airport.iata dst],
path <- ['LHR', dst],
cost_pair <- [path, dist];
routes[a2, min_cost(cost_pair)] := routes[a, prev], :flies_to[a, a2, dist],
[a2 airport.iata dst],
path <- append(first(prev), dst),
cost_pair <- [path, last(prev) + dist];
?[cost, path] := routes[dst, cost_pair], cost <- last(cost_pair), path <- first(cost_pair);
:order -cost;
:limit 10;
</textarea>
<script src="main.js"></script>
</body>
</html>