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: For all x_11, x_11 is a sailor or x_11 is poor. For all x_11, x_11 is a police officer or x_11 will not play tennis. For all x_11, if x_11 were fast, then x_11 is a police officer. There is at least one x_11 for which if x_11 were poor, then x_11 is fast. For all x_11, x_11 is not a sailor or x_11 will play tennis.
There is at least one x_11 for which if x_11 were poor, then x_11 is a police officer can be inferred via the existential transitivity rule. For all x_11, x_11 is poor or x_11 will play tennis can be inferred via the universal resolution rule. For all x_11, if x_11 plays tennis, then x_11 is a police officer can be inferred via the universal rewriting rule.