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, if x_6 writes a letter, then x_6 is poor. For all x_6, if x_6 works, then x_6 is poor. For all x_6, if x_6 were poor, then x_6 is working. There is at least one x_6 for which x_6 will write a letter.
There is at least one x_6 for which x_6 is poor. For all x_6, if x_6 writes a letter, then x_6 is working. For all x_6, x_6 will work if and only if x_6 is poor. For all x_6, x_6 is poor if and only if x_6 will work.