How to make a 3-level collapsing menu in Bootstrap?

Question

I am trying to make a 3-level collapsing navbar menu for Bootstrap, but I can\'t open the third level.

This is the two level menu which I have:

Answer 1

Bootstrap 2.3.x and later supports the dropdown-submenu..

            
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Second level
                    
Second level
                    
Second level
                
            
            
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