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 or p. p -> w. r_20 -> w. w -> q_1. ~t or r_20.
p -> q_1 can be inferred via the transitivity rule. r_20 -> q_1 can be inferred via the transitivity rule. p or r_20 can be inferred via the resolution rule.