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: There is at least one x_6 for which if x_6 goes running, then x_6 is taking a plane. For all x_6, x_6 is not a sailor or x_6 will drink water. For all x_6, x_6 will drink water if and only if x_6 will take a plane. For all x_6, x_6 is a sailor or x_6 will go running.
For all x_6, x_6 will go running or x_6 will drink water can be inferred via the universal resolution rule. For all x_6, if x_6 drinks water, then x_6 is taking a plane can be inferred via the universal biconditional elimination rule. For all x_6, if x_6 takes a plane, then x_6 is drinking water can be inferred via the universal biconditional elimination rule.