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_7 for which x_7 is fast or x_7 is a nurse. For all x_7, x_7 is not a nurse or x_7 will drink water. For all x_7, x_7 is not fast.
There is at least one x_7 for which x_7 is a nurse.