[m-dev.] Introduce !! rather than ^elem() for indexing

[Ralph Becket]

Fergus Henderson, Friday, 12 October 2001:
> 
> If you want to go down that path, another possible alternative would be
> to use '{}' instead of 'elem', i.e.
> 
> 	A^{I}

That seems like a better idea.  It just seems a little clumsy when
you can't fit simple expressions involving two or three arrays (or whatever)
on a single line.

- Ralph
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