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_8, if x_8 were excited, then x_8 is sleeping. For all x_8, x_8 is a mechanic or x_8 will make tea. For all x_8, if x_8 makes tea, then x_8 is excited. There is at least one x_8 for which x_8 is a sailor. For all x_8, if x_8 were a mechanic, then x_8 is excited.
For all x_8, if x_8 makes tea, then x_8 is sleeping can be inferred via the universal transitivity rule. For all x_8, if x_8 were a mechanic, then x_8 is sleeping can be inferred via the universal transitivity rule. For all x_8, x_8 is excited can be inferred via the universal disjunction elimination rule.