I thought I had it, but there's that condition "use all matches" which makes it tricky. My idea of a solution would have had one dangling matchstick. So my solution is no good.
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I thought I had it, but there's that condition "use all matches" which makes it tricky. My idea of a solution would have had one dangling matchstick. So my solution is no good.
Keep trying. Still unsolved 13 hours later. 🙂