16 columns
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
left
right
14 columns
left
right
14 columns
left
right
14 columns
left
right
13 columns
left
right
13 columns
left
right
12 columns
left
right
left
right
left
right
left
right
left
right
left
right
left
right
left
right