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: t -> ~P_26(a_23). t <-> q_1. forall x_26: P_26(x_26) and Q_26(x_26).
t -> q_1 can be inferred via the biconditional elimination rule. q_1 -> t can be inferred via the biconditional elimination rule. forall x_26: P_26(x_26) can be inferred via the universal simplification rule. forall x_26: Q_26(x_26) can be inferred via the universal simplification rule.