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¤~~~~~~~~~¤~~~~~~~~~¤~ERRATUM~¤~~~~~~~~~¤~~~~~~~~~¤

I omitted a figure, which left its lead-in
with nothing to lead up to.  Here is a fix:

¤~~~~~~~~~¤~~~~~~~~~¤~~~~~~~~~¤~~~~~~~~~¤~~~~~~~~~¤

We have just illustrated the circumstance -- coincidence?  I think not! --
that a deux-tuple is determined by the details of its projective pieces --
still, according to a sage bit of wisdom, if a deux-tuple di