INTRO:
first part.
--+-------------------------+- X2
--+---1-1--6-4--------------+-
--+---2-2--7-5--1-1-1-------+-
--+---2-2--7-5--2-2-2--3----+-
--+--------5-3--2-2-2--3----+-
--+--------------------1----+-
INTRO:
second part.
--+---0-0-5----------------------------+-
--+---------5-6-6-6-3--0-0-5-----------+-
--+--------------------------5-4-4-4-2-+-
--+------------------------------------+-
--+------------------------------------+-
--+------------------------------------+-
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