What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Jennifer were a server, then Thomas is cooking. Linda is not writing a letter or Charles is rich. Linda is writing a letter or Jennifer is a server. Thomas is not cooking. If Thomas cooks, then Jennifer is a server.
Jennifer is not a server. Jennifer is a server or Charles is rich. Jennifer is a server if and only if Thomas is cooking. Thomas is cooking if and only if Jennifer is a server.