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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
</body>
</html>
 
(function () {
  var x = 1, y = 2;
  console.log('inside scope', y);
})();
try {
  console.log('outside scope', y);
} catch (err) {
  console.log('error outside scope;', err.message)
}
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anonymouspro
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