. The function should
 not change any data of the pair and instead use <code>mapParallel</code> if that is a necessity. Note that this
 operation is parallel and necessary synchronisation has to be performed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>forEachFunction</code> - function to execute for each pair</dd>
</dl>
</li>
</ul>
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<h4>mapParallel</h4>
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