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: t. q <-> q_2. ~q_13. q_2 <-> q_13.
t and ~q_13 can be inferred via the conjunction rule. ~q_13 and t can be inferred via the conjunction rule. q -> q_2 can be inferred via the biconditional elimination rule. q_2 -> q_13 can be inferred via the biconditional elimination rule. q_2 -> q can be inferred via the biconditional elimination rule. q_13 -> q_2 can be inferred via the biconditional elimination rule. ~q_2 can be inferred via the biconditional elimination rule.