123456789 1 2 3 4 5 --------- --------- 132456978 - - s 143256978 - - - 124356978 - - - --------- --------- 132456879 - - s 143256879 - - - 124356879 - - - --------- --------- 132456897 - s - 143256897 - - - 124356897 - - - --------- --------- 142356798 - - - 134256798 - - - 123456798 - - - --------- --------- 142356789 - s - 134256789 - - - 123456789 - - - --------- --------- Repeat. All courses five leads long. 1350 rows ending in 123456789 Touch is true