What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is a musician if and only if x_7 is a cashier. For all x_7, x_7 is a poet if and only if x_7 is a cashier. For all x_7, x_7 is not a poet.
For all x_7, if x_7 were a musician, then x_7 is a cashier. For all x_7, if x_7 were a poet, then x_7 is a cashier. For all x_7, if x_7 were a cashier, then x_7 is a musician. For all x_7, if x_7 were a cashier, then x_7 is a poet. For all x_7, x_7 is not a cashier.