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: There is at least one x_12 for which if x_12 were an artist, then x_12 is sleeping. For all x_12, if x_12 were a scientist, then x_12 is sleeping. For all x_12, x_12 is a lawyer or x_12 will climb a mountain. For all x_12, x_12 is a scientist or x_12 is an artist. For all x_12, x_12 is not a lawyer.
For all x_12, x_12 will climb a mountain can be inferred via the universal disjunctive syllogism rule. There is at least one x_12 for which x_12 will sleep can be inferred via the existential disjunction elimination rule.