id: 16 yr ( 10, (7, 0, 2, 1)) (( 4.2, 4.3 ), ( 4.9, 2.0 ))
 +11          |                  +8 
 +    +    +    +    +    +    
           |                2012  
           |                   
           |                   
           |                   
 +    +    +    +    +    +    
           |            2017      
           |                   
           |              2021    
           |                   
 +    +    +    +   2013+2018   +    
           |                   
           |                   
           |                   
           | 2014                 
 +    +    +   +    +    +    
           |                   
           |                   
           |                   
           | 2019                 
 +    +    +    +    +    +    
           |                   
           |                   
     2016     |                   
           |                   
-+----+----+----+----+----+----
           |                   
  2015        |                   
           |                   
  2020        |                   
 +    +    +    +    +    +    
 -2          |                  -5