What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_1 for which if x_1 plays tennis, then x_1 is not fast. For all x_1, x_1 is fast. For all x_1, x_1 will play tennis if and only if x_1 is a mechanic.
There is at least one x_1 for which x_1 will not play tennis. For all x_1, if x_1 plays tennis, then x_1 is a mechanic. For all x_1, if x_1 were a mechanic, then x_1 is playing tennis.