123456789 1 2 3 4 5 6 7 8 --------- --------------- 154326789 - - - - (6 leads) 124365789 s s 163425789 - - - - (6 leads) 143256789 s - 143265789 s --------- --------------- Repeat. Courses eight leads long except as marked. 1296 rows ending in 123456789 Touch is true