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What's the motivation for this problem if there is any? It's a really specific problem.


This came from a database theory study about queries on graphs: https://dl.acm.org/doi/10.1145/3517804.3524149 for the paywalled version, https://www.theoinf.uni-bayreuth.de/pool/documents/Paper2021... for the open-access paper. But honestly I find the problem intriguing for its own sake.




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