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_11 for which if x_11 were sad, then x_11 is writing a letter. For all x_11, x_11 is an artist or x_11 will not write a letter. For all x_11, if x_11 drives a car, then x_11 is an artist. For all x_11, x_11 will make tea or x_11 is sad. For all x_11, x_11 will not make tea or x_11 will drive a car.
For all x_11, x_11 is sad or x_11 will drive a car can be inferred via the universal resolution rule. For all x_11, if x_11 writes a letter, then x_11 is an artist can be inferred via the universal rewriting rule.