So if I were to write this out, the answer is-- and if you practice this, you'll find that you can do quite fast-- it's x to the tenth, plus 10x to the ninth y, plus 45x to the eighth y squared, plus 120x to the seventh y to the third, plus 210x to the sixth y to the fourth, plus 252-- already at the middle term-- x to the fifth y to the fifth, plus 210x to the fourth y to the sixth-- I'm running out of space.