id: 281 yr ( 8, (2, 6, 0, 0)) (( 4.7, 4.7 ), ( 2.6, 8.3 ))
 +6                              +16 
+    +    +    +    +    +    + 
|                            2011  
|                               
|                          2018    
|                               
+    +    +    +    +    +    + 
|                               
|                               
|                               
|                               
+----+----+----+----+----+----+-
|                               
|                               
|                               
|               2016               
+    +    +   2012    +    +    + 
|                               
|            2017 14                  
|                               
|                               
+    +    +    +    +    +    + 
|                               
|                               
|                               
|      2015                        
+    +    +    +    +    +    + 
|                               
|                               
| 2013                             
|                               
 -10    +    +    +    +    +    +