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_1 for which x_1 is a server. For all x_1, x_1 will read a book.
Some servers will read a book can be inferred via the existential conjunction rule. There is at least one x_1 for which x_1 will read a book and x_1 is a server can be inferred via the existential conjunction rule.