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  "schema": "spectral.tetra_singular_normal_cones.v2",
  "generated_at": "2026-07-08T23:22:41-0700",
  "title": "Singular normal-cone billiard paths in the regular tetrahedron",
  "source_algorithm": "tetrahedron_singular_closed_paths.py",
  "source_notebook": "https://observablehq.com/@liuyao12/billiard-in-tetrahedra",
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