I’m stuck here… any help would be appreciated!
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Try different base at 4 and 17. Continue posting screenshots in this same thread when you get stuck and I will check in.
I just cycled through every possible combination of bases for those two locations (AUGC x AUGC), and none of them worked. But then I tried flipping everything in the stack and running through all the combinations again for those two locations, and finally got a hit with only one possibility remaining. But now I more fully understand what a block is!