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_12, if x_12 plays tennis, then x_12 is fast. For all x_12, x_12 is fast if and only if x_12 will play tennis. For all x_12, x_12 will drink water or x_12 is not fast.
For all x_12, if x_12 were fast, then x_12 is drinking water can be inferred via the universal rewriting rule. For all x_12, if x_12 were fast, then x_12 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_12, if x_12 plays tennis, then x_12 is fast can be inferred via the universal biconditional elimination rule.