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_18, x_18 will drink water if and only if x_18 is a musician. For all x_18, if x_18 plays a game, then x_18 is a musician. For all x_18, x_18 will drink water.
For all x_18, if x_18 drinks water, then x_18 is a musician can be inferred via the universal biconditional elimination rule. For all x_18, if x_18 were a musician, then x_18 is drinking water can be inferred via the universal biconditional elimination rule.