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      <h1>Sequence expressions</h1>
      <p>The expression <code>E1 , E2</code> returns the sequence obtained by concatenating the sequences
<code>E1</code> and <code>E2</code>.</p>
      <p>For example, <code>$x = ("London", "Paris", "Tokyo")</code> returns true if the value of <code>$x</code>
is one of the strings listed.</p>
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