What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Joseph is not taking a plane. William is climbing a mountain. Thomas is a police officer if and only if Joseph is taking a plane. Thomas is a police officer if and only if it is overcast.
Joseph is not taking a plane and William is climbing a mountain. William is climbing a mountain and Joseph is not taking a plane. If Thomas were a police officer, then Joseph is taking a plane. If Thomas were a police officer, then it is overcast. If Joseph takes a plane, then Thomas is a police officer. If it is overcast, then Thomas is a police officer. Thomas is not a police officer.