I've been able to solve all the ones I've gotten so far, but I'm stumped as to how to do this one (https://i.imgur.com/6qmZX7z.png https://i.imgur.com/6qmZX7z.p

I've been able to solve all the ones I've gotten so far, but I'm stumped as to how to do this one (https://i.imgur.com/6qmZX7z.png https://i.imgur.com/6qmZX7z.png) without 1. trial and error, or 2. using the checking tool to see what I did wrong (cheating in a sense) I feel like there's a strategy that I'm missing here. I'm just not sure what my next step should be, which would probably help me get all the rest done.