PM----|   PM----|   PM----|   PM----|

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

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

|---7-7-7-7---7-7-7-7------------------------|

|-6-7-7-7-7-6-7-7-7-7-5-7-7-7-7-6-7-7-7-7----|

|-6-5-5-5-5-6-5-5-5-5-5-7-7-7-7-6-7-7-7-7----|

|-4---------4---------3-5-5-5-5-4-5-5-5-5----|