What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If David were excited, then it is overcast. If David were excited, then it is overcast. If it is overcast, then it is late. If it is late, then David is excited.
If David were excited, then it is late. If David were excited, then it is late. If it is overcast, then David is excited. If it is late, then it is overcast. If it is late, then it is overcast.