(4, 4)
          ( 4 )

(42, 7)
          (    )

(33, 55)
          (    )

(2, 18)
          (    )

(25, 15)
          (    )

(63, 9)
          (    )

(72, 40)
          (    )

(35, 7)
          (    )

(6, 30)
          (    )

        +[    ]

(54, 45)
          (    )

(12, 30)
          (    )

(27, 18)
          (    )

(40, 35)
          (    )

(35, 42)
          (    )

(16, 24)
          (    )

(30, 5)
          (    )

(36, 30)
          (    )

(36, 45)
          (    )

        +[    ]

(81, 9)
          (    )

(24, 28)
          (    )

(55, 77)
          (    )

(12, 8)
          (    )

(6, 54)
          (    )

(27, 6)
          (    )

(10, 70)
          (    )

(40, 5)
          (    )

(45, 25)
          (    )

        +[    ]

(72, 81)
          (    )

(42, 36)
          (    )

(12, 20)
          (    )

(18, 3)
          (    )

(60, 10)
          (    )

(12, 27)
          (    )

(27, 24)
          (    )

(16, 24)
          (    )

(35, 7)
          (    )

        +[    ]

(20, 90)
          (    )

(64, 24)
          (    )

(21, 14)
          (    )

(4, 18)
          (    )

(4, 12)
          (    )

(60, 70)
          (    )

(72, 27)
          (    )

(21, 7)
          (    )

(16, 8)
          (    )

        +[    ]

  ++[[       ]]

(4, 4)
          ( 4 )
(42, 7)
          ( 7 )
(33, 55)
          ( 11 )
(2, 18)
          ( 2 )
(25, 15)
          ( 5 )
(63, 9)
          ( 9 )
(72, 40)
          ( 8 )
(35, 7)
          ( 7 )
(6, 30)
          ( 6 )
        +[    ]

(54, 45)
          ( 9 )
(12, 30)
          ( 6 )
(27, 18)
          ( 9 )
(40, 35)
          ( 5 )
(35, 42)
          ( 7 )
(16, 24)
          ( 8 )
(30, 5)
          ( 5 )
(36, 30)
          ( 6 )
(36, 45)
          ( 9 )
        +[    ]

(81, 9)
          ( 9 )
(24, 28)
          ( 4 )
(55, 77)
          ( 11 )
(12, 8)
          ( 4 )
(6, 54)
          ( 6 )
(27, 6)
          ( 3 )
(10, 70)
          ( 10 )
(40, 5)
          ( 5 )
(45, 25)
          ( 5 )
        +[    ]

(72, 81)
          ( 9 )
(42, 36)
          ( 6 )
(12, 20)
          ( 4 )
(18, 3)
          ( 3 )
(60, 10)
          ( 10 )
(12, 27)
          ( 3 )
(27, 24)
          ( 3 )
(16, 24)
          ( 8 )
(35, 7)
          ( 7 )
        +[    ]

(20, 90)
          ( 10 )
(64, 24)
          ( 8 )
(21, 14)
          ( 7 )
(4, 18)
          ( 2 )
(4, 12)
          ( 4 )
(60, 70)
          ( 10 )
(72, 27)
          ( 9 )
(21, 7)
          ( 7 )
(16, 8)
          ( 8 )
        +[    ]

  ++[[       ]]