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_2, if x_2 plays tennis, then x_2 is writing a letter. For all x_2, x_2 is not a doctor or x_2 will make tea. For all x_2, x_2 is a doctor or x_2 will play tennis. For all x_2, if x_2 makes tea, then x_2 is writing a letter.
For all x_2, x_2 will play tennis or x_2 will make tea can be inferred via the universal resolution rule.