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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/947557-1.html 

<!doctype html>
<body>
  <math>
    <mmultiscripts>
      <mo>A</mo>
      <mprescripts/>
      <mmultiscripts>
        <mo>A</mo>
        <mprescripts/>
        <mo>A</mo>
        <mo>A</mo>
      </mmultiscripts>
      <mmultiscripts>
        <mo>A</mo>
        <mprescripts/>
        <mo>A</mo>
        <mo>A</mo>
      </mmultiscripts>
    </mmultiscripts>
  </math>
</body>