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_12, if x_12 were a police officer, then x_12 is reading a book. There is at least one x_12 for which if x_12 works, then x_12 is a police officer. For all x_12, x_12 is an artist and x_12 is a server. For all x_12, if x_12 were an artist, then x_12 is working.
There is at least one x_12 for which if x_12 works, then x_12 is reading a book can be inferred via the existential transitivity rule. There is at least one x_12 for which if x_12 were an artist, then x_12 is a police officer can be inferred via the existential transitivity rule. For all x_12, x_12 is an artist can be inferred via the universal simplification rule. For all x_12, x_12 is a server can be inferred via the universal simplification rule.