e:---------0---0--
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:2--------------0
e:--------------0---
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:2-------2---------
e:------0-0------0-0-0---0----
:1-1-1-----3-1--------3---3-1
:----------------------------
e:------0-0------0-0-0-4-4-4
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:--------------------------
e:-------0-0------0-0-0--2---4-5
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:------------------------------