What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 will not play squash. For all x_9, if x_9 were a mechanic, then x_9 is a bartender. For all x_9, x_9 is a mechanic if and only if x_9 will play squash. For all x_9, if x_9 were a bartender, then x_9 is a mechanic.
For all x_9, x_9 is a mechanic if and only if x_9 is a bartender. For all x_9, x_9 is a bartender if and only if x_9 is a mechanic. For all x_9, if x_9 were a mechanic, then x_9 is playing squash. For all x_9, if x_9 plays squash, then x_9 is a mechanic. For all x_9, x_9 is not a mechanic.