What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, if x_7 writes a letter, then x_7 is sleeping. For all x_7, x_7 will read a book or x_7 will sleep. For all x_7, x_7 will not read a book or x_7 will cook. For all x_7, if x_7 sleeps, then x_7 is writing a letter. For all x_7, if x_7 cooks, then x_7 is writing a letter.
For all x_7, if x_7 cooks, then x_7 is sleeping. For all x_7, x_7 will sleep or x_7 will cook. For all x_7, x_7 will write a letter if and only if x_7 will sleep. For all x_7, x_7 will sleep if and only if x_7 will write a letter.