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    "nearest-neighbor",
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      "title": "donut: Nearest Neighbour Search with Variables on a Torus",
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        "donut-package",
        "donut"
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      "title": "Nearest Neighbour Search with Variables on a Torus",
      "topics": [
        "nnt"
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        "Nearest Neighbour Search with Variables on a Torus",
        "An example",
        "References"
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