x2
 P.M......|  P.M............| P.M...........|   P.M...............|
|--2---2-2-----2--------2-2----2--------2-2-----2-----------------|
|----------4-----------------4---------------4-----5-5-5-5-7-7-5-5|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
			
  
			 
			
			
			
	
	
  
			
			
			
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