id: 63 yr ( 2, (2, 0, 0, 0)) (( 0.6, 0.3 ), ( 6.5, 1.3 ))
 +8        +2 
|         
|      2010  
+    +    
|        
|         
|   2011     
|         
+    +    
|         
|         
|         
|         
+    +    
|         
|         
|         
|         
+    +    
|         
|         
|         
|         
+    +    
|         
|         
|         
|         
 0----+---