id: 76 yr ( 2, (2, 0, 0, 0)) (( 3.4, 3.1 ), ( 11.3, 6.6 ))
 +15                    +10 
+    +    +    +    + 
|                  2010  
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                    
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
+    +  2011 +    +    + 
|                     
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
+    +    +    +    + 
|                     
|                     
|                     
|                     
 0----+----+----+----+