1 -------3----------3---------------3----------3---------------
2--------3----------3---------------3----------3---------------
3----------4----------4---------------4-----------4------------
4--------------------------------------------------------------
5--------------------------------3------------3----------------
6-----3--------3--3------------3-------------------------------
1-------3-----------3---------------3------------------3------
2-------3-----------3---------------3------------------3------
3----------4------------4----------------4-----------------4--
4-------------------------------------------------------------
5-3------------------------------3-----------------3----------
6----3---------3--3----------3--------------------------------
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