This one was surprisingly tricky - as it turned out, the path I was trying to go down for a while was quite close to the correct one, but off in a meaningful way.
I was 2 off, for a very long time, here. Had two very different 2 offs. David's 36 was just hidden from my sight, somehow.
After solving it wasn't clear to me, why I couldn't see it sooner. :)
