What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: James is reading a book if and only if James is a soldier. If Susan plays a game, then Sarah is drinking water. If Sarah drinks water, then James is reading a book.
If Susan plays a game, then James is reading a book can be inferred via the transitivity rule. If James reads a book, then James is a soldier can be inferred via the biconditional elimination rule. If James were a soldier, then James is reading a book can be inferred via the biconditional elimination rule.