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: s_3 -> s_2. p -> s_2. t -> s_1. s_1 -> s_3. t or p.
t -> s_3 can be inferred via the transitivity rule. s_1 -> s_2 can be inferred via the transitivity rule.