Simple Grid
1
2
3
1
2
3
4
1
2
3
4
5
Complex grid
1
2
3
style = "--c:2">Merge the first 2 columns
2
3
4
1
style = "--c:3"> Merge 3 columns
3
1
style = "--c:2">Merge 2
style = "--c:3">Merge 3
4
5
6
7
1
Merge 2 columns
3