What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is poor if and only if x_7 will work. For all x_7, if x_7 writes a letter, then x_7 is playing tennis. For all x_7, x_7 is not poor. For all x_7, x_7 will play tennis if and only if x_7 will work.
For all x_7, if x_7 were poor, then x_7 is working. For all x_7, if x_7 plays tennis, then x_7 is working. For all x_7, if x_7 works, then x_7 is poor. For all x_7, if x_7 works, then x_7 is playing tennis. For all x_7, x_7 will not work.