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: u <-> p_16. p_16 <-> t. u -> t.
u -> p_16 can be inferred via the biconditional elimination rule. p_16 -> t can be inferred via the biconditional elimination rule. p_16 -> u can be inferred via the biconditional elimination rule. t -> p_16 can be inferred via the biconditional elimination rule.