What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? P_3(a_23). t_1 <-> q_7. forall y: P_3(y) -> R(y). ~t_1.
P_3(a_23) and ~t_1. ~t_1 and P_3(a_23). t_1 -> q_7. q_7 -> t_1. ~q_7. exists x: P_3(x).