Link the 2 columns
starting point a1
starting point a2
starting point a3
starting point a4
starting point a5
starting point a6
starting point a7
starting point a8
starting point a9
starting point a10
ending point b1
ending point b2
ending point b3
ending point b4
ending point b5
ending point b6
ending point b7
ending point b8
ending point b9
ending point b10