What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z goes running, then z is writing a letter. For all z, z will go running or z is not bored. For all z, z is bored if and only if z will write a letter.
For all z, if z were bored, then z is running. For all z, if z were bored, then z is writing a letter. For all z, if z writes a letter, then z is bored.