pmm2 Frieze Pattern

{
  "author": null,
  "context": "Fifth frieze type; has reflection symmetry in two directions and two-fold rotational symmetry.",
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  "norm_label": "pmm2 Frieze Pattern",
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  "source_file": "2022-06-06_Prabros._bridges2007-203.pdf_6211a5.md",
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