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: For all x_6, x_6 will not climb a mountain. For all x_6, if x_6 goes running, then x_6 is an electrician. There is at least one x_6 for which x_6 will climb a mountain if and only if x_6 will go running. For all x_6, if x_6 were an electrician, then x_6 is running.
For all x_6, x_6 will go running if and only if x_6 is an electrician can be inferred via the universal biconditional introduction rule. For all x_6, x_6 is an electrician if and only if x_6 will go running can be inferred via the universal biconditional introduction rule. There is at least one x_6 for which if x_6 climbs a mountain, then x_6 is running can be inferred via the existential biconditional elimination rule. There is at least one x_6 for which if x_6 goes running, then x_6 is climbing a mountain can be inferred via the existential biconditional elimination rule. There is at least one x_6 for which x_6 will not go running can be inferred via the existential biconditional elimination rule.