Fig A
|--------------------------------------------------------------
|-----10h12-10h12--------------10h12-10h12---------------------
|--10-------------8------8--10-------------8---------8---------
|---------------------10---------------------10-8-10-----------


|-----------------------------------------------------------
|-----10h12-10h12----10--------10h12-10h12----10------------
|--10-------------8------8--10-------------8------8---------
|-----------------------------------------------------------


|---------------------------------------------------------------------
|-----10h12-10h12----10--------10--------10h12-10h12------------------
|--10-------------8------8--8---------10--------------back to fig A---
|---------------------------------10----------------------------------



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Contribuição: wilimar junio ruas(juniorruas@ig.com.br)