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The solution by Steven is based on the fact that the parameter is processed. I show another solution here: the parameter is only scanned token by token. The solution is based on the code available at OPmac tricks www page. Only few lines are added in order to implement the actual task here. %% the code from http://petr.olsak.net/opmac-tricks-e.html#readtoks ...


Since counters are global quantities in LaTeX, I decided to use them to approach your problem. This doesn't give quite the answer you requested, because it prints the innermost result before it prints the outermost result in the nest. That means, for your first example, that the output is "0 1" rather than "1 0". But I'm thinking that, for what you want ...

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