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_11, x_11 is excited or x_11 will play squash. There is at least one x_11 for which if x_11 plays squash, then x_11 is a politician. For all x_11, x_11 is not a politician or x_11 is a cashier. For all x_11, if x_11 were excited, then x_11 is a politician.
There is at least one x_11 for which x_11 is a politician can be inferred via the existential disjunction elimination rule.