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: If Charles makes tea, then John is listening to a song. For all x_12, x_12 will make tea. For all x_12, x_12 is a janitor.
For all x_12, x_12 will make tea and x_12 is a janitor can be inferred via the universal conjunction rule. For all x_12, x_12 is a janitor and x_12 will make tea can be inferred via the universal conjunction rule.