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Simplest code to select random rows of two alternating excel files (avoiding delays along the experiment)

Hi @wakecarter -

In your demo, is it possible to add a constraint to the randomization so that the randomization is restricted to a select number of rows? So, for example, let’s say ColA in your conditions file was digits 1-13. Is it possible so that each number in ColA is used once for the first 13 letters in ColB and again for the last 13 letters in ColB? If so, can you pleas share? Thanks!