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: Richard is not running. For all y, y is an electrician if and only if y will go running. If Richard goes running, then Richard is an electrician.
For all y, if y were an electrician, then y is running can be inferred via the universal biconditional elimination rule. For all y, if y goes running, then y is an electrician can be inferred via the universal biconditional elimination rule.