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_11, x_11 will cook if and only if x_11 will play tennis. For all x_11, if x_11 reads a book, then x_11 is cooking. For all x_11, x_11 will play tennis if and only if x_11 will make tea. For all x_11, x_11 will make tea or x_11 will read a book.
For all x_11, if x_11 cooks, then x_11 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 plays tennis, then x_11 is making tea can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 plays tennis, then x_11 is cooking can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 makes tea, then x_11 is playing tennis can be inferred via the universal biconditional elimination rule.