2015-10-18 17:52:07 +02:00
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+-------+ +-------+--+-------+ +------+
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| | | +-+ | | | | ++
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| +----+ | | | | | +----+ | +-+ |
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| +--+ | +-+ ++ | +--+ | | | |
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S----+ | | +--+ | | | | | +--->B
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| +--+ | +-+ ++ | +--+ | | | |
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| | | | | | | +----+ | +-+ |
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| | | | | | | | | ++
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+--+-------+--+ +--+ +-------+--+------+
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