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_16, x_16 will drive a car. For all x_16, x_16 is a mechanic and x_16 will work. There is at least one x_16 for which x_16 is a writer.
For all x_16, x_16 is a mechanic can be inferred via the universal simplification rule. For all x_16, x_16 will work can be inferred via the universal simplification rule. Some writers will drive a car can be inferred via the existential conjunction rule. There is at least one x_16 for which x_16 will drive a car and x_16 is a writer can be inferred via the existential conjunction rule.