What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 were a carpenter, then x_10 is a musician. If it is late, then Charles is a musician. For all x_10, if x_10 were a musician, then x_10 is a carpenter.
For all x_10, x_10 is a carpenter if and only if x_10 is a musician. For all x_10, x_10 is a musician if and only if x_10 is a carpenter.