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1 2 3 4 5 6 7 8
L---+-------+------+------------+---------+---------+-------+-----
,
(
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N - - --
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+---+-------+------+------------+---------+---------+-------+----+
1 2 3 4 5 6 7 8
L---+-------+------+------------+---------+---------+-------+-----
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--------------------
> 1 2 ... 3 4 5