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_11 or t. t -> r_11. q <-> r_11. p_11 -> r_11.
r_11 can be inferred via the disjunction elimination rule. q -> r_11 can be inferred via the biconditional elimination rule. r_11 -> q can be inferred via the biconditional elimination rule.