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 will play tennis or x_11 is a cashier. For all x_11, x_11 is not bored. There is at least one x_11 for which x_11 will not play tennis. For all x_11, x_11 is bored or x_11 will climb a mountain.
For all x_11, x_11 will climb a mountain can be inferred via the universal disjunctive syllogism rule. There is at least one x_11 for which x_11 is a cashier can be inferred via the existential disjunctive syllogism rule.