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 -> t_1. t_1 <-> p. ~p.
t_1 -> p can be inferred via the biconditional elimination rule. p -> t_1 can be inferred via the biconditional elimination rule. ~t_1 can be inferred via the biconditional elimination rule.