id: 65 yr ( 2, (0, 0, 0, 2)) (( 0.3, 0.1 ), ( 1.6, 0.9 ))
 +2            +0 
             |
  2010          |
   +    +    +
             |
             |
            |
             |
   +    +    +
             |
             |
             |
  2011          |
   +    +    +
             |
             |
             |
             |
   +    +    +
             |
             |
             |
             |
 0--+----+-----1