8 acessos
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--------------------2------------2-------------------|
--------2----4-----------4-4-2-4---------------------|
-2-3-4-----------------------------------------------|
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then
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---------------2------------------------------|
-----2----4--------4---2----------------------|
-234----------------------4----2--------------|
-----------------------------------1----------|
opening
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-4-------------------------------|
-2---232323232323232--------4----|
----------------------3---3------|