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<h4 class="subsection">2.7.8 Deconstruction</h4>

<p>Much of the time required for evaluating a function is devoted to
<a name="index-deconstruction-290"></a>performing deconstruction operations, e.g., taking the left side of a
pair, the tail of a list, the right side of the head of the tail, etc.. 
Because these operations are so frequent, there are some features of the
virtual machine to make them as efficient as possible.

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