(28, 49)
          ( 7 )

(30, 25)
          (    )

(9, 3)
          (    )

(36, 16)
          (    )

(9, 6)
          (    )

(50, 10)
          (    )

(24, 40)
          (    )

(32, 4)
          (    )

(20, 25)
          (    )

        +[    ]

(63, 56)
          (    )

(66, 77)
          (    )

(70, 90)
          (    )

(35, 21)
          (    )

(33, 88)
          (    )

(63, 56)
          (    )

(25, 45)
          (    )

(18, 63)
          (    )

(8, 6)
          (    )

        +[    ]

(40, 30)
          (    )

(24, 20)
          (    )

(66, 55)
          (    )

(24, 28)
          (    )

(28, 49)
          (    )

(30, 25)
          (    )

(7, 7)
          (    )

(10, 25)
          (    )

(45, 81)
          (    )

        +[    ]

(54, 6)
          (    )

(20, 90)
          (    )

(72, 45)
          (    )

(40, 35)
          (    )

(8, 16)
          (    )

(18, 9)
          (    )

(10, 14)
          (    )

(6, 4)
          (    )

(32, 36)
          (    )

        +[    ]

(14, 35)
          (    )

(28, 63)
          (    )

(18, 24)
          (    )

(10, 20)
          (    )

(20, 5)
          (    )

(72, 64)
          (    )

(72, 81)
          (    )

(21, 12)
          (    )

(90, 10)
          (    )

        +[    ]

  ++[[       ]]

(28, 49)
          ( 7 )
(30, 25)
          ( 5 )
(9, 3)
          ( 3 )
(36, 16)
          ( 4 )
(9, 6)
          ( 3 )
(50, 10)
          ( 10 )
(24, 40)
          ( 8 )
(32, 4)
          ( 4 )
(20, 25)
          ( 5 )
        +[    ]

(63, 56)
          ( 7 )
(66, 77)
          ( 11 )
(70, 90)
          ( 10 )
(35, 21)
          ( 7 )
(33, 88)
          ( 11 )
(63, 56)
          ( 7 )
(25, 45)
          ( 5 )
(18, 63)
          ( 9 )
(8, 6)
          ( 2 )
        +[    ]

(40, 30)
          ( 10 )
(24, 20)
          ( 4 )
(66, 55)
          ( 11 )
(24, 28)
          ( 4 )
(28, 49)
          ( 7 )
(30, 25)
          ( 5 )
(7, 7)
          ( 7 )
(10, 25)
          ( 5 )
(45, 81)
          ( 9 )
        +[    ]

(54, 6)
          ( 6 )
(20, 90)
          ( 10 )
(72, 45)
          ( 9 )
(40, 35)
          ( 5 )
(8, 16)
          ( 8 )
(18, 9)
          ( 9 )
(10, 14)
          ( 2 )
(6, 4)
          ( 2 )
(32, 36)
          ( 4 )
        +[    ]

(14, 35)
          ( 7 )
(28, 63)
          ( 7 )
(18, 24)
          ( 6 )
(10, 20)
          ( 10 )
(20, 5)
          ( 5 )
(72, 64)
          ( 8 )
(72, 81)
          ( 9 )
(21, 12)
          ( 3 )
(90, 10)
          ( 10 )
        +[    ]

  ++[[       ]]