What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it is overcast, then Jessica is writing a letter. If Jessica were a janitor, then it is overcast. For all x_10, x_10 is a janitor or x_10 will write a letter. If Jessica writes a letter, then it is overcast.
If Jessica were a janitor, then Jessica is writing a letter.