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_8, x_8 will read a book if and only if x_8 is an artist. For all x_8, x_8 is an artist if and only if x_8 will read a book.
For all x_8, if x_8 reads a book, then x_8 is an artist can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were an artist, then x_8 is reading a book can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were an artist, then x_8 is reading a book can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 reads a book, then x_8 is an artist can be inferred via the universal biconditional elimination rule.