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      "title": "A PD4 group without an aspherical manifold model",
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      "url": "https://github.com/openai/math/blob/fd4aeeb2ee4fc729c18d98444fed42fd0529eeeb/preprints/A-PD4-group-without-an-aspherical-manifold-model-September-24-2026/paper.pdf",
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