What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is cooking. Jennifer is not a musician. For all x_13, x_13 is a taxi driver if and only if x_13 is a musician.
Susan is cooking and Jennifer is not a musician. Jennifer is not a musician and Susan is cooking. For all x_13, if x_13 were a taxi driver, then x_13 is a musician. For all x_13, if x_13 were a musician, then x_13 is a taxi driver.