data = [
             {a: 1, value: 12}, {a: 11, value: 39}, {a: 11, value: 150},
             {a: 2, value: 15}, {a: 22, value: 83}, {a: 222, value: 12},
             {a: 3, value: 55}, {a: 33, value: 9}, {a: 33, value: 1}
           ]

data = [
         {a: 1, value: 12}, {a: 11, value: 150},
         {a: 2, value: 15}, {a: 22, value: 83}, {a: 222, value: 12},
         {a: 3, value: 55}, {a: 33, value: 9},
       ]