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: William is climbing a mountain if and only if Barbara is working. For all x_14, x_14 will work.
If William climbs a mountain, then Barbara is working can be inferred via the biconditional elimination rule. If Barbara works, then William is climbing a mountain can be inferred via the biconditional elimination rule.