randomize part of trialist

[Eli Koren]

Hi There!
1)How can i make random order trialist  for each part of the triallist
 separately
for example random order 1-60
                    random order 61-120
                    random order 121-180
2)How can do it with condition of not more then 3 trials with the same
attribute for
example VF can be LVF or RVF , i want not more 3 trials consecutiv e be the
same VF attribute?

Thanks
Eli Koren

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