What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Sarah takes a plane, then Linda is making tea. If Linda makes tea, then Elisabeth is a carpenter. If Elisabeth were a carpenter, then Mary is sad. Jessica is not a sailor. If Mary were sad, then Jessica is a sailor.
Mary is not sad. If Sarah takes a plane, then Elisabeth is a carpenter. If Linda makes tea, then Mary is sad. If Elisabeth were a carpenter, then Jessica is a sailor.