(70, 90)
          ( 10 )

(63, 18)
          (    )

(25, 35)
          (    )

(8, 2)
          (    )

(16, 40)
          (    )

(80, 70)
          (    )

(12, 18)
          (    )

(44, 11)
          (    )

(30, 5)
          (    )

        +[    ]

(72, 64)
          (    )

(77, 88)
          (    )

(6, 18)
          (    )

(12, 21)
          (    )

(99, 44)
          (    )

(30, 20)
          (    )

(36, 9)
          (    )

(5, 5)
          (    )

(24, 20)
          (    )

        +[    ]

(24, 54)
          (    )

(40, 25)
          (    )

(42, 35)
          (    )

(21, 9)
          (    )

(22, 99)
          (    )

(30, 80)
          (    )

(72, 16)
          (    )

(20, 45)
          (    )

(14, 4)
          (    )

        +[    ]

(36, 63)
          (    )

(4, 36)
          (    )

(18, 24)
          (    )

(18, 30)
          (    )

(21, 7)
          (    )

(48, 54)
          (    )

(63, 49)
          (    )

(11, 33)
          (    )

(30, 10)
          (    )

        +[    ]

(54, 12)
          (    )

(20, 15)
          (    )

(24, 15)
          (    )

(27, 72)
          (    )

(24, 4)
          (    )

(77, 66)
          (    )

(25, 35)
          (    )

(15, 5)
          (    )

(9, 21)
          (    )

        +[    ]

  ++[[       ]]

(70, 90)
          ( 10 )
(63, 18)
          ( 9 )
(25, 35)
          ( 5 )
(8, 2)
          ( 2 )
(16, 40)
          ( 8 )
(80, 70)
          ( 10 )
(12, 18)
          ( 6 )
(44, 11)
          ( 11 )
(30, 5)
          ( 5 )
        +[    ]

(72, 64)
          ( 8 )
(77, 88)
          ( 11 )
(6, 18)
          ( 6 )
(12, 21)
          ( 3 )
(99, 44)
          ( 11 )
(30, 20)
          ( 10 )
(36, 9)
          ( 9 )
(5, 5)
          ( 5 )
(24, 20)
          ( 4 )
        +[    ]

(24, 54)
          ( 6 )
(40, 25)
          ( 5 )
(42, 35)
          ( 7 )
(21, 9)
          ( 3 )
(22, 99)
          ( 11 )
(30, 80)
          ( 10 )
(72, 16)
          ( 8 )
(20, 45)
          ( 5 )
(14, 4)
          ( 2 )
        +[    ]

(36, 63)
          ( 9 )
(4, 36)
          ( 4 )
(18, 24)
          ( 6 )
(18, 30)
          ( 6 )
(21, 7)
          ( 7 )
(48, 54)
          ( 6 )
(63, 49)
          ( 7 )
(11, 33)
          ( 11 )
(30, 10)
          ( 10 )
        +[    ]

(54, 12)
          ( 6 )
(20, 15)
          ( 5 )
(24, 15)
          ( 3 )
(27, 72)
          ( 9 )
(24, 4)
          ( 4 )
(77, 66)
          ( 11 )
(25, 35)
          ( 5 )
(15, 5)
          ( 5 )
(9, 21)
          ( 3 )
        +[    ]

  ++[[       ]]