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_16, if x_16 were a carpenter, then x_16 is reading a book. For all x_16, if x_16 reads a book, then x_16 is a carpenter. There is at least one x_16 for which x_16 will drink water. For all x_16, x_16 is a carpenter or x_16 will not drink water.
For all x_16, if x_16 drinks water, then x_16 is a carpenter can be inferred via the universal rewriting rule. For all x_16, x_16 is a carpenter if and only if x_16 will read a book can be inferred via the universal biconditional introduction rule. For all x_16, x_16 will read a book if and only if x_16 is a carpenter can be inferred via the universal biconditional introduction rule.