(50, 10)
          ( 10 )

(10, 4)
          (    )

(15, 40)
          (    )

(30, 35)
          (    )

(56, 7)
          (    )

(90, 80)
          (    )

(11, 22)
          (    )

(28, 49)
          (    )

(99, 11)
          (    )

        +[    ]

(28, 24)
          (    )

(21, 12)
          (    )

(18, 4)
          (    )

(20, 10)
          (    )

(56, 7)
          (    )

(70, 60)
          (    )

(18, 81)
          (    )

(15, 6)
          (    )

(10, 90)
          (    )

        +[    ]

(18, 15)
          (    )

(70, 30)
          (    )

(10, 15)
          (    )

(4, 14)
          (    )

(45, 10)
          (    )

(24, 18)
          (    )

(15, 9)
          (    )

(88, 11)
          (    )

(54, 45)
          (    )

        +[    ]

(18, 15)
          (    )

(49, 7)
          (    )

(16, 6)
          (    )

(30, 12)
          (    )

(22, 33)
          (    )

(7, 42)
          (    )

(20, 4)
          (    )

(28, 49)
          (    )

(6, 4)
          (    )

        +[    ]

(24, 42)
          (    )

(6, 42)
          (    )

(6, 9)
          (    )

(20, 36)
          (    )

(21, 28)
          (    )

(35, 40)
          (    )

(10, 6)
          (    )

(12, 16)
          (    )

(60, 70)
          (    )

        +[    ]

  ++[[       ]]

(50, 10)
          ( 10 )
(10, 4)
          ( 2 )
(15, 40)
          ( 5 )
(30, 35)
          ( 5 )
(56, 7)
          ( 7 )
(90, 80)
          ( 10 )
(11, 22)
          ( 11 )
(28, 49)
          ( 7 )
(99, 11)
          ( 11 )
        +[    ]

(28, 24)
          ( 4 )
(21, 12)
          ( 3 )
(18, 4)
          ( 2 )
(20, 10)
          ( 10 )
(56, 7)
          ( 7 )
(70, 60)
          ( 10 )
(18, 81)
          ( 9 )
(15, 6)
          ( 3 )
(10, 90)
          ( 10 )
        +[    ]

(18, 15)
          ( 3 )
(70, 30)
          ( 10 )
(10, 15)
          ( 5 )
(4, 14)
          ( 2 )
(45, 10)
          ( 5 )
(24, 18)
          ( 6 )
(15, 9)
          ( 3 )
(88, 11)
          ( 11 )
(54, 45)
          ( 9 )
        +[    ]

(18, 15)
          ( 3 )
(49, 7)
          ( 7 )
(16, 6)
          ( 2 )
(30, 12)
          ( 6 )
(22, 33)
          ( 11 )
(7, 42)
          ( 7 )
(20, 4)
          ( 4 )
(28, 49)
          ( 7 )
(6, 4)
          ( 2 )
        +[    ]

(24, 42)
          ( 6 )
(6, 42)
          ( 6 )
(6, 9)
          ( 3 )
(20, 36)
          ( 4 )
(21, 28)
          ( 7 )
(35, 40)
          ( 5 )
(10, 6)
          ( 2 )
(12, 16)
          ( 4 )
(60, 70)
          ( 10 )
        +[    ]

  ++[[       ]]