What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Susan writes a letter, then James is a server. If James were a server, then John is curious. John is curious if and only if Susan is writing a letter.
If Susan writes a letter, then John is curious. If John were curious, then Susan is writing a letter. If Susan writes a letter, then John is curious.