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: For all x_13, if x_13 drinks water, then x_13 is a soldier. For all x_13, x_13 will drink water if and only if x_13 will read a book. If Jessica were a soldier, then Jessica is reading a book.
For all x_13, if x_13 drinks water, then x_13 is reading a book can be inferred via the universal biconditional elimination rule. For all x_13, if x_13 reads a book, then x_13 is drinking water can be inferred via the universal biconditional elimination rule.