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: ~q. p_11 -> p. q <-> p. p -> p_11.
p_11 <-> p can be inferred via the biconditional introduction rule. p <-> p_11 can be inferred via the biconditional introduction rule. q -> p can be inferred via the biconditional elimination rule. p -> q can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.