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, x_13 is a cashier. For all x_13, if x_13 drinks water, then x_13 is playing tennis. For all x_13, x_13 will work. For all x_13, if x_13 writes a letter, then x_13 is playing tennis. There is at least one x_13 for which x_13 is not a cashier or x_13 will write a letter.
For all x_13, x_13 is a cashier and x_13 will work. For all x_13, x_13 will work and x_13 is a cashier.