What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? James is not playing tennis. John is a mechanic if and only if Robert is a nurse. James is playing tennis if and only if John is a mechanic. Karen is fast.
James is not playing tennis and Karen is fast. Karen is fast and James is not playing tennis. If John were a mechanic, then Robert is a nurse. If James plays tennis, then John is a mechanic. If Robert were a nurse, then John is a mechanic. If John were a mechanic, then James is playing tennis. John is not a mechanic.