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: w or q_7. ~u_2. q_2 <-> u_2. q_2 <-> q_7. ~w or u_1.
q_7 or u_1 can be inferred via the resolution rule. q_2 -> u_2 can be inferred via the biconditional elimination rule. q_2 -> q_7 can be inferred via the biconditional elimination rule. u_2 -> q_2 can be inferred via the biconditional elimination rule. q_7 -> q_2 can be inferred via the biconditional elimination rule. ~q_2 can be inferred via the biconditional elimination rule.