What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x were a musician, then x is rich. For all x, x is not rich. For all x, if x were rich, then x is a musician. Charles is a musician if and only if it is sunny.
If Charles were a musician, then it is sunny. If it is sunny, then Charles is a musician. For all x, x is not a musician. For all x, x is a musician if and only if x is rich. For all x, x is rich if and only if x is a musician.