--5-5-5-5-5-5-5-5------------------------------

------------------7-7-7-7-5-5-5-5--------------

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--4-5-7--4-5-7--4-5-7--4-5-7-------------------

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ref.:

--------------5--5-----------------------------

--9--9--5--5--------7--7--9--9-----------------

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