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_7, x_7 is an electrician if and only if x_7 is fast. Elisabeth is an electrician.
There is at least one x for which x is an electrician can be inferred via the existential generalization rule. For all x_7, if x_7 were an electrician, then x_7 is fast can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were fast, then x_7 is an electrician can be inferred via the universal biconditional elimination rule.