What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_19, x_19 will sleep or x_19 is a mechanic. For all x_19, x_19 is not a musician or x_19 will cook. For all x_19, if x_19 were a mechanic, then x_19 is sad. For all x_19, if x_19 drives a car, then x_19 is writing a letter. For all x_19, x_19 will cook if and only if x_19 will write a letter. For all x_19, x_19 is a musician or x_19 will drive a car. There is at least one x_19 for which if x_19 sleeps, then x_19 is sad.
For all x_19, x_19 will drive a car or x_19 will cook. There is at least one x_19 for which x_19 is sad. For all x_19, if x_19 cooks, then x_19 is writing a letter. For all x_19, if x_19 writes a letter, then x_19 is cooking.