What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 were a mechanic, then x_10 is happy. For all x_10, x_10 is a janitor or x_10 will sleep. For all x_10, x_10 is happy or x_10 is not excited. For all x_10, x_10 is not a janitor. For all x_10, x_10 is excited or x_10 is a mechanic.
For all x_10, x_10 will sleep. For all x_10, if x_10 were excited, then x_10 is happy.