"refS.html#same/3">same/3</a></code>, <code><a
href="refB.html#bool/3">bool/3</a></code>, <code><a
href="refR.html#range/3">range/3</a></code>, <code><a
href="refH.html#head/3">head/3</a></code>, <code><a
href="refF.html#fold/3">fold/3</a></code>, <code><a
href="refP.html#part/3">part/3</a></code> or <code><a
href="refT.html#tolr/3">tolr/3</a></code>) especially suited for that task.


<p><hr>
<h3><a id="little">A Little Report</a></h3>

<p>Assume we want to know how many pieces of item #2 were sold in the 