big col spanning cell X X
X big col spanning cell X
X X big col spanning cell

big col spanning cell X X
X big col spanning cell X
X X big col spanning cell

big_col_spanning_cell X X
X big_col_spanning_cell X
X X big_col_spanning_cell

big_col_spanning_cell X X
X big_col_spanning_cell X
X X big_col_spanning_cell