What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is not a carpenter. William is a cashier if and only if Karen is a carpenter. Elisabeth is making tea if and only if William is a cashier.
If William were a cashier, then Karen is a carpenter. If Elisabeth makes tea, then William is a cashier. If Karen were a carpenter, then William is a cashier. If William were a cashier, then Elisabeth is making tea. William is not a cashier.