I am trying to figure out precisely what is destructive overlap. Does destructive overlap
imply nonconcurrent copy (and vice versa)?  For example:

 ds 0d
a ds 12x
b ds 16x
  mvc a(16),b

Here is an overlap but it is non-destructive. I would assume the copy is concurrent?
But if I code

  mvc b(16),a

the overlap is destructive (ie b won't necessarily be an exact copy of a). Would a concurrent copy occur? (in this case, a concurrent copy could occur without affecting
the result).

Thanks, Greg Smith

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