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Expansion of a digraph with a doubly bidirectionally connected pair is not cactus. (arXiv:2312.17327v1 [math.CO]) http://arxiv.org/abs/2312.17327
Expansion of a digraph with a doubly bidirectionally connected pair is not cactus. (arXiv:2312.17327v1 [math.CO]) http://arxiv.org/abs/2312.17327