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_1 -> q_11. p -> u_1. p <-> q_11.
p -> q_11 can be inferred via the transitivity rule. p -> q_11 can be inferred via the biconditional elimination rule. q_11 -> p can be inferred via the biconditional elimination rule.