loop-scope {
  forward--1: fore(1);
  forward--2: fore(2);
  forward--3: fore(3);
  forward--4: fore(4);
  forward--5: fore(5);
  forward--6: fore(6);
  forward--7: fore(7);
  forward--8: fore(8);
  forward--9: fore(9);
  backward-1: back(1);
  backward-2: back(2);
  backward-3: back(3);
  backward-4: back(4);
  backward-5: back(5);
  backward-6: back(6);
  backward-7: back(7);
  backward-8: back(8);
  backward-9: back(9);
}