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_9. p_9 <-> p_1. p_1 or q.
p_9 -> p_1 can be inferred via the biconditional elimination rule. p_1 -> p_9 can be inferred via the biconditional elimination rule. ~p_1 can be inferred via the biconditional elimination rule.