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_8, x_8 is bored if and only if x_8 will drink water. For all x_8, x_8 will drink water if and only if x_8 is sad.
For all x_8, if x_8 were bored, then x_8 is drinking water can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 drinks water, then x_8 is sad can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 drinks water, then x_8 is bored can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were sad, then x_8 is drinking water can be inferred via the universal biconditional elimination rule.