Owl, sorry to to say, but I cheated.

I "found" the answer to this problem, and the only thing that I can tell is that this one is far from being completely resolved for 99% of the persons who access "Perplexus".

I, now, know the answer. I needed to know it.

But, as a matter of question of respect to you, I will not post the completely answer. Unless, you authorize me to do it.