id: 66 yr ( 2, (2, 0, 0, 0)) (( 0.2, 0.2 ), ( 3.6, 3.0 ))
 +4                    +4 
|                     
|                  2010  
+    +    +    +    + 
|                     
|                    
|                     
|                     
+    +    +    +    + 
|                  2011  
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
 0----+----+----+----+