What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: It is snowing. If Susan drinks water, then John is not a musician. If it is sunny, then John is a musician. It is snowing if and only if John is a musician. If Susan goes running, then Susan is drinking water.
If Susan goes running, then John is not a musician can be inferred via the transitivity rule. If it snows, then John is a musician can be inferred via the biconditional elimination rule. If John were a musician, then it is snowing can be inferred via the biconditional elimination rule.