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_5, if x_5 were curious, then x_5 is drinking water. For all x_5, if x_5 drinks water, then x_5 is curious. For all x_5, if x_5 were curious, then x_5 is not making tea. There is at least one x_5 for which x_5 will make tea.
There is at least one x_5 for which x_5 is not curious can be inferred via the existential modus tollens rule. For all x_5, x_5 is curious if and only if x_5 will drink water can be inferred via the universal biconditional introduction rule. For all x_5, x_5 will drink water if and only if x_5 is curious can be inferred via the universal biconditional introduction rule.