Visualizing chords in colors

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <script src="https://d3js.org/d3.v4.min.js"></script>
​
  <link rel="stylesheet" href="style.css">
  <title>Chord Synesthesia with Force Layout</title>
​
</head>
<body>
  <svg width="900" height="1400">
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  </svg>
  <script src="./chords.js"></script>
</body>
</html>
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https://d3js.org/d3.v4.min.js