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: If Jennifer takes a plane, then it is snowing. Jennifer is taking a plane if and only if Karen is climbing a mountain. Karen is climbing a mountain.
If Jennifer takes a plane, then Karen is climbing a mountain can be inferred via the biconditional elimination rule. If Karen climbs a mountain, then Jennifer is taking a plane can be inferred via the biconditional elimination rule.