This thread opened on a speculative note, and seems to have benefited from observations and excursions into the surrounding thoughtscape. One never knows what piece of information might strike a spark and illuminate the darkness, or what might be found therein.
Tangential byways sometimes lead to serendipitous discoveries, though I hasten to admit that Serendip is probably too southerly to be considered relevant to the subject(s) herein under discussion.
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