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--------0---------------0---------------0---------------0-------|
----0-------0-------0-------0-------0-------0-------0-------0---|
2---------------1---------------0---------------0---------------|
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----------------------------------------------------------------|

----------------------------------------------------------------|
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--------4---------------4---------------3---------------3-------|
----2-------2-------2-------2-------2-------2-------2-------2---|
4---------------4---------------3---------------3---------------|
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--------3---------------3---------------2---------------2-------|
----1-------1-------1-------1-------1-------1-------1-------1---|
3---------------3---------------2---------------2---------------|
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0-----------------------0---------------------------------------|
0-----------------------0---------------------------------------|
0-------0---1---0-------0---------------------------------------|
2-----------------------2---------------------------------------|
2-----------------------2---------------------------------------|
0-------------------0---0---------------------------------------|