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: p <-> r. p_11 or q_11. q_11 -> t_2. r -> ~t_2. p_11 -> t_2.
t_2 can be inferred via the disjunction elimination rule. p -> r can be inferred via the biconditional elimination rule. r -> p can be inferred via the biconditional elimination rule.