id: 168 yr ( 6, (0, 6, 0, 0)) (( 1.9, 2.2 ), ( 4.2, 6.9 ))
 +0                            +12 
|                             
+----+----+----+----+----+-2018--
|                             
|                             
|                             
|                             
+    +    +    +    +    +    
|                             
|                   2016         
|                             
|                             
+    +    +    + ↷  +    +    
|                             
|              2017 15              
|                             
|                             
+    +    + 2014 13  +    +    +    
|                             
 -6