id: 107 yr ( 11, (2, 0, 9, 0)) (( 6.9, 7.1 ), ( 2.6, 7.0 ))
 +8                         |       +5 
 +    +    +    +    +    +    +   
                          |     2021  
                          |        
                          | 2018      
                          |        
 +    +    +    +    +    +    +   
                          |        
                          |        
                          |        
                          |        
-+----+----+----+----+----+----+---
                   20162020     |        
                 20122015 132019 17      |        
                         |        
                          |        
 +    +    +    +    +    +    +   
                          |        
                          |        
                          |        
                          |        
 +    +    +    +    +    +    +   
                          |        
                          |        
                          |        
                          |        
 +    +    +    +    +    +    +   
     2014                    |        
                          |        
                          |        
  2011                       |        
 +    +    +    +    +    +    +   
 -17                         |       -21