1)-11-12-11-9-7---9-7-5-4-5--5-4-2-0--------|
2)------------------------------------------|
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4)------------------------------------------|
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1)---0-2-4-2-0------------------------------|
2)-1-----------3-1--------------------------|
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1)-11-12-14-----16-16-16-16-16--12-11-9-7-5-|
2)----------11------------------------------|
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