Never use more than one horizontal divider

Always place the horizontal divider after the regular dividers for columns

Combinations that work.

1. No dividers. Results in a page with one div tag.

2. One divider. Results in a page with two columns.

3. One divider and one horizontal divider. Results in a page with two columns and a horizontal div after the two columns.

4. Two dividers. Results in a page with three columns.

5. Two dividers and one horizontal divider. Results in a page with three columns and a horizontal div after the two columns.