(36, 16)
          ( 4 )

(20, 15)
          (    )

(6, 9)
          (    )

(18, 3)
          (    )

(72, 8)
          (    )

(20, 24)
          (    )

(12, 3)
          (    )

(36, 81)
          (    )

(40, 90)
          (    )

        +[    ]

(3, 9)
          (    )

(30, 10)
          (    )

(33, 22)
          (    )

(72, 32)
          (    )

(8, 10)
          (    )

(6, 10)
          (    )

(24, 20)
          (    )

(12, 42)
          (    )

(10, 18)
          (    )

        +[    ]

(20, 24)
          (    )

(20, 45)
          (    )

(9, 27)
          (    )

(10, 15)
          (    )

(30, 6)
          (    )

(28, 7)
          (    )

(14, 35)
          (    )

(55, 77)
          (    )

(35, 5)
          (    )

        +[    ]

(16, 72)
          (    )

(8, 56)
          (    )

(11, 99)
          (    )

(6, 15)
          (    )

(45, 18)
          (    )

(72, 40)
          (    )

(12, 28)
          (    )

(36, 4)
          (    )

(9, 3)
          (    )

        +[    ]

(33, 77)
          (    )

(8, 20)
          (    )

(55, 66)
          (    )

(2, 4)
          (    )

(45, 18)
          (    )

(54, 6)
          (    )

(63, 36)
          (    )

(12, 42)
          (    )

(5, 10)
          (    )

        +[    ]

  ++[[       ]]

(36, 16)
          ( 4 )
(20, 15)
          ( 5 )
(6, 9)
          ( 3 )
(18, 3)
          ( 3 )
(72, 8)
          ( 8 )
(20, 24)
          ( 4 )
(12, 3)
          ( 3 )
(36, 81)
          ( 9 )
(40, 90)
          ( 10 )
        +[    ]

(3, 9)
          ( 3 )
(30, 10)
          ( 10 )
(33, 22)
          ( 11 )
(72, 32)
          ( 8 )
(8, 10)
          ( 2 )
(6, 10)
          ( 2 )
(24, 20)
          ( 4 )
(12, 42)
          ( 6 )
(10, 18)
          ( 2 )
        +[    ]

(20, 24)
          ( 4 )
(20, 45)
          ( 5 )
(9, 27)
          ( 9 )
(10, 15)
          ( 5 )
(30, 6)
          ( 6 )
(28, 7)
          ( 7 )
(14, 35)
          ( 7 )
(55, 77)
          ( 11 )
(35, 5)
          ( 5 )
        +[    ]

(16, 72)
          ( 8 )
(8, 56)
          ( 8 )
(11, 99)
          ( 11 )
(6, 15)
          ( 3 )
(45, 18)
          ( 9 )
(72, 40)
          ( 8 )
(12, 28)
          ( 4 )
(36, 4)
          ( 4 )
(9, 3)
          ( 3 )
        +[    ]

(33, 77)
          ( 11 )
(8, 20)
          ( 4 )
(55, 66)
          ( 11 )
(2, 4)
          ( 2 )
(45, 18)
          ( 9 )
(54, 6)
          ( 6 )
(63, 36)
          ( 9 )
(12, 42)
          ( 6 )
(5, 10)
          ( 5 )
        +[    ]

  ++[[       ]]