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Graham,

I have no conception of what you might consider to be
a "positive contribution" (PC), but perhaps you would
be so kind as to randomly sample some of the dedicata
that I have dedicated these times of my life to infra:

I have tried to include mostly what I consider to be
positive contributions.  Of course, this is relative
to my peculiar ideas of what comprises consideration.
For instance, I consider a notice like "Look out for
that iceberg