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<div id="correct">
<div class="one two three">
<div class="four five">
</div>
<div class="six seven content">
<div>
</div>
Blah
</div>
</div>
</div>
<div id="missing-class">
<div class="one two three">
<div class="five">
</div>
<div class="six seven content">
<div>
</div>
Blah
</div>
</div>
</div>
<div id="extra-class">
<div class="one two three">
<div class="four five five-point-five">
</div>
<div class="six seven content">
<div>
</div>
Blah
</div>
</div>
</div>
<div id="missing-child">
<div class="one two three">
<div class="six seven content">
<div>
</div>
Blah
</div>
</div>
</div>
<div id="extra-child">
<div class="one two three">
<div class="four five">
<div class="five-point-five">
</div>
</div>
<div class="six seven content">
<div>
</div>
Blah
</div>
</div>
</div>