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_19, x_19 will not play tennis. For all x_19, if x_19 climbs a mountain, then x_19 is running. For all x_19, x_19 will climb a mountain or x_19 is a carpenter. For all x_19, if x_19 were a carpenter, then x_19 is running. There is at least one x_19 for which x_19 will play tennis or x_19 is poor.
There is at least one x_19 for which x_19 is poor can be inferred via the existential disjunctive syllogism rule. For all x_19, x_19 will go running can be inferred via the universal disjunction elimination rule.