What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Jennifer is climbing a mountain or James is not writing a letter. Jennifer is climbing a mountain or it is not overcast. It is sunny or James is writing a letter. If it is sunny, then it is overcast.
If James writes a letter, then Jennifer is climbing a mountain. If it is overcast, then Jennifer is climbing a mountain.