I was talking about this just a couple of days ago while dog walking. I thought 3 interlaced circles of 17 stars would do it. I didn't know Wikipedia had already figured it out.

figured already how to do it.
figured how already it could be done.
had figured it out already (apologies to the irritating grammar thread).

I was so afraid we'd have to conquer another part of Mexico to make it an even number.