static private $lengthRows = array(
                        10, 12, 14, 16, 18, 20, 22, 24, 26,  // 24 squares et 6 rectangular
                        32, 36, 40, 44, 48, 52, 64, 72, 80,  88, 96, 104, 120, 132, 144,
                        8, 8, 12, 12, 16, 16);