|----------3-3---------3-3--------7-7---5-5--3-3-3-3--
 |----5-5---5-5---5-5---5-5--------9-9---7-7--5-5-5-5--
 |----7-7---------7-7----------------------------------
 |-----------------------------------------------------   
 |-----------------------------------------------------
 |-----------------------------------------------------

 |----------3-3---------3-3--------7-7---5-5--3-3-3-3--
 |----5-5---5-5---5-5---5-5--------9-9---7-7--5-5-5-5--
 |----7-7---------7-7----------------------------------
 |-----------------------------------------------------   
 |-----------------------------------------------------
 |-----------------------------------------------------
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