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_1. ~p_19 -> u. w. p_19 <-> p_1.
~p_1 and w can be inferred via the conjunction rule. w and ~p_1 can be inferred via the conjunction rule. p_19 -> p_1 can be inferred via the biconditional elimination rule. p_1 -> p_19 can be inferred via the biconditional elimination rule. ~p_19 can be inferred via the biconditional elimination rule.