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_11, x_11 is poor if and only if x_11 is an electrician. Linda is not an electrician. If Linda were not poor, then Richard is playing tennis.
For all x_11, if x_11 were poor, then x_11 is an electrician can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were an electrician, then x_11 is poor can be inferred via the universal biconditional elimination rule.