When presented with a non-linear combination of two variables (Variable A and Variable B) that lead to a single outcome (Outcome C): When presented with a non-linear combination of two variables (Variable A and Variable B) that lead to a single outcome (Outcome C): Either variable (A or B) is sufficient to produce the outcome. Both variables (A and B) must be present to produce the outcome. Variable A causes Variable B, which in turn, causes Outcome C. Outcome C is caused by a third, unrelated variable.