intro

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-5-5-5-------------5-5-5--------3-3-2-2-2-
-5-5-5-------------5-5-5--------3-3-2-2-2-
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3-3-3-3-5-5-5-2----3-3-3-3-3-3-5-5-5-5-5-2-
3-3-3-3-5-5-5-0----3-3-3-3-3-3-5-5-5-5-5-0-