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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>Example</title>
</head>
<body>
<p>Login names can only use letters from A to Z (upper or lowercase)
and the character underscore (_) and minus (-).
For example: <code its-allowed-characters="[a-zA-Z_\-]">Huck_Finn</code>.</p>
</body>
</html>