What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, if x_17 were happy, then x_17 is an astronaut. For all x_17, x_17 is an office clerk if and only if x_17 is happy. There is at least one x_17 for which x_17 will sleep. For all x_17, if x_17 were an office clerk, then x_17 is not sleeping. For all x_17, if x_17 were an astronaut, then x_17 is happy.
There is at least one x_17 for which x_17 is not an office clerk. For all x_17, x_17 is happy if and only if x_17 is an astronaut. For all x_17, x_17 is an astronaut if and only if x_17 is happy. For all x_17, if x_17 were an office clerk, then x_17 is happy. For all x_17, if x_17 were happy, then x_17 is an office clerk.