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_9, if x_9 takes a plane, then x_9 is a lawyer. For all x_9, x_9 will play a game or x_9 will sleep. For all x_9, if x_9 sleeps, then x_9 is taking a plane. For all x_9, if x_9 were happy, then x_9 is a lawyer. For all x_9, if x_9 plays a game, then x_9 is happy.
For all x_9, if x_9 sleeps, then x_9 is a lawyer can be inferred via the universal transitivity rule. For all x_9, if x_9 plays a game, then x_9 is a lawyer can be inferred via the universal transitivity rule.