id: 108 yr ( 10, (8, 0, 1, 1)) (( 3.3, 3.0 ), ( 8.0, 1.5 ))
 +11               |           +5 
 +    +    +    +    +    +  
                |      2015 13  2019 18  
                |            
                | 2014  2017 2020     
                |            
 +    +    +    +    +    +  
                | 2012         
                |            
                |            
                |            
 +    +    +    +    +    +  
              2016 |            
                |            
                |            
                |            
 +    +    +    +    +    +  
                |            
                |            
                |            
                |            
 +    +    +    +    +    +  
                |            
                |            
                |            
                |            
-+----+----+----+----+----+--
                |            
  2021             |            
                |            
 -2               |           -7