id: 309 yr ( 5, (0, 0, 3, 2)) (( 2.7, 2.6 ), ( 0.7, 6.0 ))
 +3                            +0 
                             |
    +    +    +   2012+ 2015  +    +
                             |
                             |
                             |
                             |
----+----+----+----+----+----+
                             |
                            |
             2013               |
                             |
    +    +2014   +    +    +    +
                             |
                             |
                             |
                             |
    +    +    +    +    +    +
                             |
                             |
  2011                          |
                             |
 -6   +    +    +    +    +    -11