What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, z will make tea if and only if z is an astronaut. There is at least one z for which z is not a poet. For all z, z is an astronaut or z is not a poet. For all z, if z were an astronaut, then z is a poet.
There is at least one z for which z is not an astronaut. For all z, if z were a poet, then z is an astronaut. For all z, if z makes tea, then z is an astronaut. For all z, if z were an astronaut, then z is making tea.