What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 writes a letter, then x_9 is a sailor. For all x_9, x_9 will sleep or x_9 will not cook. For all x_9, if x_9 sleeps, then x_9 is climbing a mountain. For all x_9, if x_9 were a sailor, then x_9 is cooking.
For all x_9, if x_9 writes a letter, then x_9 is cooking. For all x_9, if x_9 cooks, then x_9 is sleeping.