Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div id="wrapper">
  <div class="main">
  </div>
</div>

Preparation code output

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var $main = $("#wrapper .main");

var $wrapper = $("#wrapper");
var $main = $(".main", $wrapper);

var $wrapper = $("#wrapper");
var $main = $wrapper.find(".main");

var $main = $("#wrapper").find(".main");

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