Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div id="id">
<div class="class"></div><div class="class"></div>
<div class="class"></div><div class="class"></div>
<div class="class2"></div><div class="class2"></div>
<div class="class2"></div><div class="class2"></div>
</div>
<div class="class2"></div><div class="class2"></div>
<div class="class2"></div><div class="class2"></div>
 

Preparation code output

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$(".class");

$("#id .class");

$(".class2");

$("#id .class2");

$("#id").find(".class");

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