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 drinking water. For all x_12, x_12 is an electrician if and only if x_12 will drink water. Richard is an electrician or Charles is not running.
If Charles goes running, then Richard is an electrician can be inferred via the rewriting rule. For all x_12, if x_12 were an electrician, then x_12 is drinking water can be inferred via the universal biconditional elimination rule. For all x_12, if x_12 drinks water, then x_12 is an electrician can be inferred via the universal biconditional elimination rule.