What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 will read a book if and only if x_10 will play tennis. For all x_10, x_10 will not write a letter. For all x_10, if x_10 writes a letter, then x_10 is reading a book. For all x_10, if x_10 writes a letter, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is writing a letter.
For all x_10, x_10 will not read a book. For all x_10, x_10 will write a letter if and only if x_10 will read a book. For all x_10, x_10 will write a letter if and only if x_10 will read a book. For all x_10, x_10 will read a book if and only if x_10 will write a letter. For all x_10, x_10 will read a book if and only if x_10 will write a letter. For all x_10, if x_10 reads a book, then x_10 is playing tennis. For all x_10, if x_10 plays tennis, then x_10 is reading a book.