What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Richard were a scientist, then Mary is not curious. If Richard were a scientist, then Mary is a musician. Mary is curious. If Mary were a musician, then Richard is a scientist.
Richard is not a scientist. If Mary were a musician, then Mary is not curious. Richard is a scientist if and only if Mary is a musician. Mary is a musician if and only if Richard is a scientist.