What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Elisabeth is not an office clerk. It is windy if and only if Elisabeth is an office clerk. Joseph is not playing squash. Joseph is playing squash if and only if Barbara is a lawyer.
Elisabeth is not an office clerk and Joseph is not playing squash. Joseph is not playing squash and Elisabeth is not an office clerk. If it is windy, then Elisabeth is an office clerk. If Joseph plays squash, then Barbara is a lawyer. If Elisabeth were an office clerk, then it is windy. If Barbara were a lawyer, then Joseph is playing squash. Barbara is not a lawyer. It is not windy.