id: 272 yr ( 8, (0, 0, 7, 1)) (( 4.7, 4.1 ), ( 5.1, 10.3 ))
 +1                             +0 
                              |
+----+----+----+----+2012---+----+
                    2013         |
                              |
                              |
                 2016 15            |
+    +    +    +    +    +    +
               2014              |
               2011              |
                             |
                              |
+    +    +    +    +    +    +
                              |
                              |
         2017                    |
                              |
+    +    +    +    +    +    +
                              |
                              |
                              |
                              |
+    +    +    +    +    +    +
                              |
                              |
                              |
  2018                           |
+    +    +    +    +    +    +
 -16                             -20