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      <div><h1><span class="kind-method">removeFirst</span> method</h1></div>

    <section class="multi-line-signature">
      <span class="returntype">E</span>
            <span class="name ">removeFirst</span>
(<wbr>)
      <div class="features">override</div>
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    <section class="desc markdown">
      <p>Removes and returns the first element of this queue.</p>
<p>The queue must not be empty when 