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_8, if x_8 were bored, then x_8 is a janitor. There is at least one x_8 for which if x_8 cooks, then x_8 is a janitor. For all x_8, x_8 is bored or x_8 will cook. For all x_8, x_8 will play squash.
There is at least one x_8 for which x_8 is a janitor can be inferred via the existential disjunction elimination rule.