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Prevent overlapping between 2 Experiments

[ Edited ]
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# 1
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Could you please help me with a rule that can exclude users that have already been exposed to one of other experiments in Google Optimize?


What is the best approach?


I am thinking about using 1st party cookie variable or some other custom variable that would mark the user as "exposed" so that another experiment will not affect him.

In addition I can use "run custom "JavaScript" in Optimize's visual editor that will create such a cookie. Will that solve the problem?


Also I can't understand how to prevent 2 experiments from running simultaneously. So that user who sees experiment A will not see experiment B or C (free version is limited to 3 experiments). Is there any rules or configuration that can help with that?