x---- x - x - x- c---- c - c - c- x---- x - x - x- c---- c - c - c- [lx] k j--- [lx] k j [lx] k j k l [kc] j---- [lc] k j [lc] k j k l [kx] j---- [zv] k j [zv] k j [kv] l [kc] j---k l [kc] j-c - c- x---- x - x - x- c---- c - c - c- [lx] k j--- [lx] k j [lx] k j k l [kc] j---- [lc] k j [lc] k j k l [kx] j---- [zv] k j [zv] k j [kv] l [kc] j---k l [kc] j-c - c