          /  1  \
|                           /       \
|                (object) C - - - - - B (sign')
|                           \       /
|                            \  2  /
|                             \   /
|                              \ /
|                               B' (sign&quot;)

Because of the circumstance that rendering a 3-tuple &lt;x, y, z&gt; of any 3-adic relation
in the figure of a plane triangle will frequently mislead the viewer to imagine that
all 3-adic relations can be decompos