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    <section id='declaration' class='declaration'>
  <h2>Declaration</h2>
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    <pre class='source indented'><code><span class='token-keyword'>func</span> <span class='token-identifier'>merge</span>(<span class='token-externalParam'>maxConcurrent</span>: Int) -&gt; Observable&lt;Self.Element.Element&gt;</code></pre>
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</section><div class='content'><h2 id='return-