x² - 9x + 18 = 0
                        ( 3 )

x² - 12x + 36 = 0
                        (    )

x² - 9x + 20 = 0
                        (    )

x² - 13x + 36 = 0
                        (    )

x² + 17x + 72 = 0
                        (    )

x² - 4x + 4 = 0
                        (    )

x² + 17x + 72 = 0
                        (    )

x² + 16x + 63 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² - 8x + 12 = 0
                        (    )

                      +[    ]

x² + 8x + 12 = 0
                        (    )

x² + 11x + 28 = 0
                        (    )

x² - 10x + 24 = 0
                        (    )

x² - 10x + 25 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² + 12x + 35 = 0
                        (    )

x² - 4x + 4 = 0
                        (    )

x² + 15x + 54 = 0
                        (    )

x² - 6x + 8 = 0
                        (    )

x² + 11x + 28 = 0
                        (    )

                      +[    ]

x² + 12x + 32 = 0
                        (    )

x² - 10x + 21 = 0
                        (    )

x² - 10x + 16 = 0
                        (    )

x² - 13x + 40 = 0
                        (    )

x² + 11x + 28 = 0
                        (    )

x² + 8x + 16 = 0
                        (    )

x² - 12x + 36 = 0
                        (    )

x² - 9x + 20 = 0
                        (    )

x² - 12x + 35 = 0
                        (    )

x² + 8x + 15 = 0
                        (    )

                      +[    ]
                 +++[[       ]]