Running a new procedure after fixed number of trials

[Christina B Young]

Hello,
I am running into a problem that hopefully has a straight-forward
solution.  In my experiment, I have 90 trials that occur in random
order and the randomization is critical.  However, after the 30ths and
60th trial, I would like to add a new procedure, but then have the
experiment continue with the original trials.  So the order would be:
29th trial, 30th trial, new procedure, 31st trial, 32nd trial, etc.
Does anyone have any ideas on how to do this?  Thanks!

Christina

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