What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is drinking water if and only if Barbara is a nurse. Joseph is not reading a book. Michael is drinking water if and only if Joseph is reading a book.
If Michael drinks water, then Barbara is a nurse. If Michael drinks water, then Joseph is reading a book. If Barbara were a nurse, then Michael is drinking water. If Joseph reads a book, then Michael is drinking water. Michael is not drinking water.