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_14 for which x_14 will play tennis if and only if x_14 is an office clerk. For all x_14, if x_14 were an office clerk, then x_14 is drinking water. For all x_14, if x_14 drinks water, then x_14 is an office clerk. For all x_14, if x_14 drinks water, then x_14 is an office clerk. For all x_14, x_14 will not play tennis.
For all x_14, x_14 is an office clerk if and only if x_14 will drink water can be inferred via the universal biconditional introduction rule. For all x_14, x_14 is an office clerk if and only if x_14 will drink water can be inferred via the universal biconditional introduction rule. For all x_14, x_14 will drink water if and only if x_14 is an office clerk can be inferred via the universal biconditional introduction rule. For all x_14, x_14 will drink water if and only if x_14 is an office clerk can be inferred via the universal biconditional introduction rule. There is at least one x_14 for which if x_14 plays tennis, then x_14 is an office clerk can be inferred via the existential biconditional elimination rule. There is at least one x_14 for which if x_14 were an office clerk, then x_14 is playing tennis can be inferred via the existential biconditional elimination rule. There is at least one x_14 for which x_14 is not an office clerk can be inferred via the existential biconditional elimination rule.