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, x will play tennis. For all x, x will drink water if and only if x will play tennis.
For all x, if x drinks water, then x is playing tennis can be inferred via the universal biconditional elimination rule. For all x, if x plays tennis, then x is drinking water can be inferred via the universal biconditional elimination rule.