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Sep 15, 2019 at 22:41 comment added Mario Krenn Hi Sheridan Grant, thanks for the answer. I think this does not really solve the question, because what i need is that the upper-case indices of the variables in each product contain the first $m$ letters in the alphabet. Please see my bullet point 1 after example $n=6$.
Sep 15, 2019 at 22:30 review First posts
Sep 16, 2019 at 1:24
Sep 15, 2019 at 22:26 history answered Sheridan Grant CC BY-SA 4.0