-----------------------------------------------------------------------------------------
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---------------------------------------------------3-3-3-3-3-3-3-3--------------------------------
------------------4-4-4-4-4-4-4-4-----------------------------------------------------------------
-----------------------------------2-2-2-2-2-2-2-2------------------------------------------------
---1-1-1-1-1-1-1-1-------------------------------------------------4-4-4-4-4-4-4-4-----------------------

--22-22-22-------------------------------------------------------------------------------------
-----------20-20b----13b------------------------------------------------------------------------------------------------------------------------------------------------------------------
------------------7b----------------------------------------------------------------------------------------------------------------------------------------------------------------
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