What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is an astronaut. For all x_6, if x_6 were curious, then x_6 is happy. For all x_6, x_6 is a carpenter or x_6 is curious. For all x_6, if x_6 were a carpenter, then x_6 is not an astronaut.
For all x_6, x_6 is not a carpenter.