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_4, x_4 will work if and only if x_4 will go running. For all x_4, if x_4 goes running, then x_4 is working.
For all x_4, if x_4 works, then x_4 is running can be inferred via the universal biconditional elimination rule. For all x_4, if x_4 goes running, then x_4 is working can be inferred via the universal biconditional elimination rule.