@extra-set/reduce

by wolfram77
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.cast - original recording .txt - plain text version .gif - animated GIF
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https://asciinema.org/a/339344
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asciinema play 339344.cast
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<html>
<head>
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</head>
<body>
  <div id="player"></div>
  <script src="/assets/asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/339344.cast',
      document.getElementById('player'),
      { cols: 122, rows: 17 }
    );
  </script>
</body>
</html>

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agg https://asciinema.org/a/339344 demo.gif
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agg demo.cast demo.gif
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See agg manual for full usage instructions.