Find the smallest possible set (that is, the set with the least number of elements) that contains the given sets as subsets. 
Definitions:
Test Statistic
A value calculated from sample data during a hypothesis test used to make a decision about the null hypothesis.
Null Hypothesis
A statement of no effect or no difference, used as a starting assumption for statistical significance testing.
Grand Mean
The mean of means, calculated by taking the average of several group means.
Completely Randomized
A design in experiments where all subjects have an equal chance of being assigned to any group or treatment.
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