NeoPa, thanks for the tip about pasting images; I wasn't aware of the <IMG> tag; I have now used it below.
NauticalAgent, I ran your untested code and it worked! So we're on the right track.
Unfortunately, I had oversimplified my query in an attempt to make it usable in my post, and I am struggling to apply your principles to the actual case. I have now generated...
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