                  cc     := -
                             x, y    x
(%i2) cc [u, v];
                                v
(%o2)                           -
                                u
(%i3) cc [4, z];
                                z
(%o3)                           -
                                4
(%i4) listarray (cc);
                              z  v
(%o4)                        [-, -]
                              4  u
(%i5) arrayinfo (cc);
(%o5)              [hashed, 2, [4, z], [u, v]]
</pre>
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