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|-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----|

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|-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-----------------------|