What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_11 for which if x_11 takes a plane, then x_11 is working. For all x_11, x_11 is a politician or x_11 will take a plane. For all x_11, x_11 will work or x_11 is not a politician. For all x_11, if x_11 were sad, then x_11 is not working.
For all x_11, if x_11 were a politician, then x_11 is working.