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 "distance": {
  "d": 20,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
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   ]
  },
  "Z": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
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   ]
  }
 },
 "provenance": {
  "authors": [
   "Lee, Jong Yeon"
  ],
  "origin": "baseline",
  "construction": "Cyclic all-one pair-partition CPM CSS construction (arXiv:2607.14091), instance PPS170_n170_k8_d20 (internal id j5l10_p17_c0000): lift size p=17, (J,L)=(5,10), n=10*p=170, 5*p=85 checks per side, column weight 5, row weight 10. CPM exponent arrays (rows = CPM block-rows, columns = the 10 block-columns): E_X = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 15, 4, 3, 8, 7, 6, 5, 10, 2], [0, 16, 12, 5, 3, 1, 10, 14, 13, 15], [0, 10, 11, 12, 4, 9, 3, 16, 8, 1], [0, 6, 10, 16, 15, 11, 1, 2, 9, 7]], E_Z = [[0, 11, 8, 15, 6, 11, 6, 0, 8, 15], [0, 7, 9, 14, 10, 9, 0, 14, 10, 7], [0, 1, 16, 13, 2, 0, 1, 16, 13, 2], [0, 9, 3, 1, 5, 1, 3, 5, 9, 0], [0, 2, 1, 10, 7, 7, 10, 2, 0, 1]]. Lift convention per the authors' expand_and_verify_cpm_matrices.py (github.com/kasaikenta/pair-partition-cpm-css-codes @ 9c2a6f2): check a of block-row b on side S has support {10*((a - E_S[b][t]) mod 17) + t : t=0..9}. Source file https://kasai.ict.eng.isct.ac.jp/pair_partition_cpm_css_codes_data/contributed_codes/jong_yeon_lee/codes/PPS170_n170_k8_d20.cpm (sha256 4dbb0cbdfb14734094f05e6eda96b006f9379dcfbdc6200d262c72f09b337f14), expanded with the authors' own script.",
  "date": "2026",
  "references": [
   "arXiv:2607.14091"
  ],
  "novelty": "known_parameters",
  "notes": "Literature baseline, seeded 2026-08-14. Listed as PPS170 [[170,8,20]] in the contributed-codes section (Jong Yeon Lee, 19 CPM-PP codes) of the Okada-Kasai pair-partition CPM catalogue (arXiv:2607.14091; catalogue page updated 2026-08-13), which reports the distance as exact. No public machine-verified distance certificate bundle covers this instance (checked master_manifest.json of certificate_bundles_20260805), so it is recorded here strictly as a witness-backed upper bound from this repo's own 300000-trial RIS search per side (seed 11). Reproduction was validated end to end: the published .cpm file expanded with the authors' own script gives a CSS-orthogonal regular pair with the claimed k."
 },
 "family": "pair-partition-cpm"
}