Grid: 6, 6, 8, 8|8, 6, 10, 8|4, 8, 6, 10|6, 8, 8, 10|8, 8, 10, 10|4, 640, 6, 642|10, 640, 12, 642|6, 642, 8, 644|8, 642, 10, 644