1234567 1 2 3 4
------- -------
1265437 -     -  (6 leads)
1365427     s
1562437     -
1263457     -
1362457       s
1623457       -
1236457       -
------- -------
Repeat twice.
Courses four leads long except as marked.
1260 rows ending in 1234567
Touch is true