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 -> r_6. p_4 -> r_6. ~t_3. s <-> t_3. p_4 or p.
r_6 can be inferred via the disjunction elimination rule. s -> t_3 can be inferred via the biconditional elimination rule. t_3 -> s can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule.