What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_6, if x_6 were an office clerk, then x_6 is not a musician. For all x_6, x_6 is an office clerk or x_6 will drink water. For all x_6, x_6 is a musician.
For all x_6, x_6 is not an office clerk can be inferred via the universal modus tollens rule.