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_10, if x_10 were a writer, then x_10 is a server. There is at least one x_10 for which if x_10 were a server, then x_10 is a janitor. For all x_10, x_10 is curious. For all x_10, x_10 is a writer.
For all x_10, x_10 is a server can be inferred via the universal modus ponens rule. There is at least one x_10 for which if x_10 were a writer, then x_10 is a janitor can be inferred via the existential transitivity rule. For all x_10, x_10 is curious and x_10 is a writer can be inferred via the universal conjunction rule. For all x_10, x_10 is a writer and x_10 is curious can be inferred via the universal conjunction rule.