What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, if x_13 goes running, then x_13 is writing a letter. For all x_13, x_13 is a doctor if and only if x_13 will drink water. For all x_13, if x_13 works, then x_13 is running. For all x_13, x_13 will work. For all x_13, if x_13 writes a letter, then x_13 is drinking water.
For all x_13, x_13 will go running. For all x_13, if x_13 goes running, then x_13 is drinking water. For all x_13, if x_13 works, then x_13 is writing a letter. For all x_13, if x_13 were a doctor, then x_13 is drinking water. For all x_13, if x_13 drinks water, then x_13 is a doctor.