I asked a similar question a while ago, and lots of fellow monks helped me at that time, and I learned a lot, (now their names are much more familiar to me than they did back then ;-)

Make some slight changes to some of those solutions, you will get what you want.

I don't want to steal their smart solutions, and make those look like mine, so I just give you the link to that thread, you can see those solutions and their authors.