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Assume you have three input variables x1, x2, and x3. The value spaces of each input variable are split into two equivalence classes as shown below:
x1: EC1=(min-int, 0) - invalid; EC2=[0, max-int) - valid
x2: EC3=(min-int, 0) - invalid; EC2=[0, max-int) - valid
x3: EC3=(min-int, 0) - invalid; EC2=[0, max-int) - valid
What set of test cases (input side) covers all possible combinations of input equivalence classes?