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: It is overcast and Barbara is listening to a song. Joseph is running and John is driving a car.
It is overcast can be inferred via the simplification rule. Barbara is listening to a song can be inferred via the simplification rule. Joseph is running can be inferred via the simplification rule. John is driving a car can be inferred via the simplification rule.