At this point, you're probably overthinking it. You've been staring at this problem for weeks, and it's still not working out. That's because, as the great philosopher, Dr. Reginald P. Pimpleton, once said, "The more you think, the less you see."
Don't believe him? Try it for yourself: take a break from your computer. Go for a walk. Stare at a tree. Watch a bird. Do something that doesn't involve a screen. When you return, you'll be amazed at the clarity that's been missing.
Or, if all else fails, just move on to Step 8: The Art of Doing Nothing