x² - 9x + 18 = 0
                        ( 3 )

x² - 10x + 21 = 0
                        (    )

x² - 13x + 36 = 0
                        (    )

x² - 4x + 4 = 0
                        (    )

x² - 11x + 28 = 0
                        (    )

x² - 13x + 40 = 0
                        (    )

x² - 13x + 36 = 0
                        (    )

x² - 9x + 20 = 0
                        (    )

x² - 7x + 10 = 0
                        (    )

x² - 10x + 21 = 0
                        (    )

                      +[    ]

x² - 10x + 16 = 0
                        (    )

x² - 11x + 28 = 0
                        (    )

x² - 15x + 56 = 0
                        (    )

x² - 17x + 72 = 0
                        (    )

x² - 11x + 24 = 0
                        (    )

x² - 12x + 27 = 0
                        (    )

x² - 11x + 30 = 0
                        (    )

x² - 9x + 20 = 0
                        (    )

x² - 11x + 30 = 0
                        (    )

x² - 9x + 18 = 0
                        (    )

                      +[    ]

x² - 7x + 10 = 0
                        (    )

x² - 7x + 10 = 0
                        (    )

x² - 10x + 25 = 0
                        (    )

x² - 15x + 54 = 0
                        (    )

x² - 15x + 56 = 0
                        (    )

x² - 14x + 48 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² - 6x + 8 = 0
                        (    )

x² - 14x + 45 = 0
                        (    )

x² - 10x + 16 = 0
                        (    )

                      +[    ]
                 +++[[       ]]