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 <-> w_1. p <-> w_1.
p -> w_1 can be inferred via the biconditional elimination rule. p -> w_1 can be inferred via the biconditional elimination rule. w_1 -> p can be inferred via the biconditional elimination rule. w_1 -> p can be inferred via the biconditional elimination rule.