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, x_12 will take a plane and x_12 is a bartender. There is at least one x_12 for which x_12 will sleep and x_12 is a server.
For all x_12, x_12 will take a plane can be inferred via the universal simplification rule. For all x_12, x_12 is a bartender can be inferred via the universal simplification rule. There is at least one x_12 for which x_12 will sleep can be inferred via the existential simplification rule. There is at least one x_12 for which x_12 is a server can be inferred via the existential simplification rule.