-----------------------------
árvore vazia
-----------------------------
            (-inf,2)
         (-inf,2]
            [2,2] 1
      (-inf,5)
         (2,5) 1
   (-inf,7)
         [5,5]
      [5,7) 2 1
         (5,7)
(-inf,+inf)
         [7,7] 1
      [7,12) 2
         (7,12)
   [7,+inf)
         [12,12] 2
      [12,+inf)
         (12,+inf)
-----------------------------

1 2 
-----------------------------
         (-inf,6)
      (-inf,6]
         [6,6] 3
   (-inf,8)
      (6,8) 3
(-inf,+inf)
      [8,8] 3
   [8,+inf)
      (8,+inf)
-----------------------------
            (-inf,2)
         (-inf,2]
            [2,2] 1
      (-inf,5)
         (2,5) 1
   (-inf,7)
         [5,5]
      [5,7) 2 1
         (5,7)
(-inf,+inf)
         [7,7] 1
      [7,12) 2
         (7,12)
   [7,+inf)
         [12,12] 2
      [12,+inf)
         (12,+inf)
-----------------------------

1 2 3 
-----------------------------
árvore vazia
-----------------------------
            (-inf,1)
         (-inf,1]
            [1,1] 6
      (-inf,7)
         (1,7) 6
   (-inf,12)
         [7,7]
      [7,12) 6 5
         (7,12)
(-inf,+inf)
         [12,12] 5
      [12,19) 6
         (12,19)
   [12,+inf)
         [19,19] 6
      [19,+inf)
         (19,+inf)
-----------------------------
               (-inf,2)
            (-inf,2]
               [2,2] 1
         (-inf,5)
            (2,5) 1
      (-inf,6)
            [5,5]
         [5,6) 2 1
            (5,6)
   (-inf,8)
            [6,6]
         [6,7) 1
            (6,7)
      [6,8) 3 2
            [7,7] 1
         [7,8)
            (7,8)
(-inf,+inf)
            [8,8] 3
         [8,9)
            (8,9)
      [8,12) 2
            [9,9]
         [9,12) 4
            (9,12)
   [8,+inf)
            [12,12] 2
         [12,15) 4
            (12,15)
      [12,+inf)
            [15,15] 4
         [15,+inf)
            (15,+inf)
-----------------------------

1 2 3 6 
6 
1 2 6 
-----------------------------
árvore vazia
-----------------------------
árvore vazia
-----------------------------
            (-inf,2)
         (-inf,2]
            [2,2] 9
      (-inf,10]
            (2,10)
         (2,10]
            [10,10] 10
   (-inf,13]
            (10,11)
         (10,11]
            [11,11] 12 11
      (10,13] 10
            (11,13)
         (11,13] 12 11
            [13,13]
(-inf,+inf)
            (13,15)
         (13,15] 12
            [15,15]
      (13,17) 11
         (15,17)
   (13,+inf)
         [17,17] 11
      [17,+inf)
         (17,+inf)
-----------------------------
               (-inf,1)
            (-inf,1]
               [1,1] 6
         (-inf,2]
               (1,2)
            (1,2] 6
               [2,2] 7 1
      (-inf,5]
               (2,4)
            (2,4]
               [4,4] 8
         (2,5] 7 6 1
               (4,5)
            (4,5]
               [5,5] 2
   (-inf,9)
               (5,6)
            (5,6] 7
               [6,6] 3
         (5,7] 1
               (6,7)
            (6,7] 3
               [7,7] 5
      (5,9) 6 2
               (7,8)
            (7,8] 3
               [8,8]
         (7,9) 5
            (8,9)
(-inf,+inf)
            [9,9]
         [9,12) 5 2
            (9,12)
      [9,15) 6 4
            [12,12] 5 2
         [12,15)
            (12,15)
   [9,+inf)
            [15,15] 4
         [15,19) 6
            (15,19)
      [15,+inf)
            [19,19] 6
         [19,+inf)
            (19,+inf)
-----------------------------

nenhum segmento
1 2 3 5 6 
-----------------------------
         (-inf,4)
      (-inf,4]
         [4,4] 15
   (-inf,9)
      (4,9) 15
(-inf,+inf)
      [9,9] 15
   [9,+inf)
      (9,+inf)
-----------------------------
         (-inf,1)
      (-inf,1]
         [1,1] 14
   (-inf,7]
         (1,7)
      (1,7] 14
         [7,7] 13
(-inf,+inf)
         (7,20)
      (7,20] 13
         [20,20]
   (7,+inf)
      (20,+inf)
-----------------------------
            (-inf,2)
         (-inf,2]
            [2,2] 9
      (-inf,10]
            (2,10)
         (2,10]
            [10,10] 10
   (-inf,13]
            (10,11)
         (10,11]
            [11,11] 12 11
      (10,13] 10
            (11,13)
         (11,13] 12 11
            [13,13]
(-inf,+inf)
            (13,15)
         (13,15] 12
            [15,15]
      (13,17) 11
         (15,17)
   (13,+inf)
         [17,17] 11
      [17,+inf)
         (17,+inf)
-----------------------------
               (-inf,1)
            (-inf,1]
               [1,1] 6
         (-inf,2]
               (1,2)
            (1,2] 6
               [2,2] 7 1
      (-inf,5]
               (2,4)
            (2,4]
               [4,4] 8
         (2,5] 7 6 1
               (4,5)
            (4,5]
               [5,5] 2
   (-inf,9)
               (5,6)
            (5,6] 7
               [6,6] 3
         (5,7] 1
               (6,7)
            (6,7] 3
               [7,7] 5
      (5,9) 6 2
               (7,8)
            (7,8] 3
               [8,8]
         (7,9) 5
            (8,9)
(-inf,+inf)
            [9,9]
         [9,12) 5 2
            (9,12)
      [9,15) 6 4
            [12,12] 5 2
         [12,15)
            (12,15)
   [9,+inf)
            [15,15] 4
         [15,19) 6
            (15,19)
      [15,+inf)
            [19,19] 6
         [19,+inf)
            (19,+inf)
-----------------------------

13 
1 2 3 5 6 13 14 15 
-----------------------------
árvore vazia
-----------------------------
árvore vazia
-----------------------------
árvore vazia
-----------------------------
árvore vazia
-----------------------------
                  (-inf,1)
               (-inf,1]
                  [1,1] 14 6
            (-inf,2)
               (1,2) 14 6
         (-inf,4)
               [2,2] 9
            [2,4) 14 7 6 1
               (2,4)
      (-inf,6)
               [4,4] 8
            [4,5)
               (4,5)
         [4,6) 15 14 7 6 1
               [5,5]
            [5,6) 2
               (5,6)
   (-inf,10)
               [6,6] 7
            [6,7) 14 1
               (6,7)
         [6,8) 15 3
               [7,7] 14 1
            [7,8) 13 5
               (7,8)
      [6,10) 6 2
               [8,8] 3
            [8,9) 15
               (8,9)
         [8,10) 13 5
               [9,9] 15
            [9,10) 4
               (9,10)
(-inf,+inf)
               [10,10]
            [10,11)
               (10,11)
         [10,12) 10 5 2
               [11,11]
            [11,12) 12 11
               (11,12)
      [10,15) 16 13 6 4
               [12,12] 5 2
            [12,13) 10
               (12,13)
         [12,15) 12 11
               [13,13] 10
            [13,15)
               (13,15)
   [10,+inf)
               [15,15] 12 4
            [15,17) 11
               (15,17)
         [15,19) 16 13 6
               [17,17] 11
            [17,19)
               (17,19)
      [15,+inf)
               [19,19] 6
            [19,20) 16 13
               (19,20)
         [19,+inf)
               [20,20] 16 13
            [20,+inf)
               (20,+inf)
-----------------------------

1 2 3 6 7 14 15 
6 14 
1 2 6 7 14 15 
1 6 7 8 14 15 
1 2 3 5 6 13 14 15 
2 4 5 6 10 11 12 13 16 
2 4 5 6 10 11 12 13 16