|---------------------------------------------------------| |---------------------------------------------------------| |---------------------------------------------------------| |---------------------------------------------------------| |-1---1-1-1-1-1---1--------1---1-1-1-1-1---1---1-1-1-1----| |-2---2-2-2-2-2---2--2(b)--2---2-2-2-2-2---2---2-2-2-2----| |------------------------------------------------------------------| |------------------------------------------------------------------| |------------------------------------------------------------------| |------------------------------------------------------------------| |-1-1-1-1-1---1--------1---1-1-1-1-1---1-1-1-----------------------| |-2-2-2-2-2---2--2(b)--2---2-2-2-2-2---2-2-2-----------------------|