What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_31 or u_1. p_12 -> ~u_1. p -> p_4. p_31 <-> t. ~t. ~p_4.
~p. ~t and ~p_4. ~p_4 and ~t. p_31 -> t. t -> p_31. ~p_31.