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Mapping and AppendTo


I would like mix use of Map and AppendTo in the following way (e.g.):

M = {{0,1,2},{4,5,6,7}};

Of course, this doesn't work, because {0,1,2} is not a symbol name,etc.
Is there a way to use Hold or Sow to make this construct work?


M. Schettler

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