[Cin] Nested clip and proxy

[Phyllis Smith]

Andrea:

Thanks, it helps! I like your 'stupid' examples.
> I wonder if we should include them in the manual.
> For these examples and for the changes proposed in the other message
> (sequences in a master project), I await the opinion of Phyllis.
>

I agree, nesting needs more explanation and reasons to use. I hope no one
minds if I rewrite it a little though.  Phyllis
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