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_9, x_9 is not a soldier. For all x_9, x_9 will play squash. For all x_9, x_9 is an artist. There is at least one x_9 for which x_9 is a soldier or x_9 is a writer.
There is at least one x_9 for which x_9 is a writer can be inferred via the existential disjunctive syllogism rule. For all x_9, x_9 will play squash and x_9 is an artist can be inferred via the universal conjunction rule. For all x_9, x_9 is an artist and x_9 will play squash can be inferred via the universal conjunction rule.