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 will play tennis if and only if x_8 is curious. For all x_8, x_8 will play tennis if and only if x_8 is a sailor. For all x_8, x_8 is not curious.
For all x_8, if x_8 plays tennis, then x_8 is curious can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 plays tennis, then x_8 is a sailor can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were curious, then x_8 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were a sailor, then x_8 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_8, x_8 will not play tennis can be inferred via the universal biconditional elimination rule.