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_5, x_5 will go running or x_5 will write a letter. For all x_5, x_5 is excited. For all x_5, x_5 will not go running.
For all x_5, x_5 will write a letter can be inferred via the universal disjunctive syllogism rule.