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Ah, I see Frank got there 5 seconds before me!! |
Marvelous, thanks you. I'd missed that second usage of Tuples. Jim |
Ah, thank you: HoldAll is what I need. I had stumbled into it in my earlier search of a solution, but hadn't inderstood the description. It seems to me that what it does, at least in this context, is to convert pass-by-value to pass-by-reference. |