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_14, x_14 will play squash or x_14 will write a letter. For all x_14, if x_14 writes a letter, then x_14 is reading a book. There is at least one x_14 for which x_14 will not play squash.
There is at least one x_14 for which x_14 will write a letter can be inferred via the existential disjunctive syllogism rule.