[
  {
    "mechanism": "list permutation",
    "object": "ordered festival weights",
    "held": "count multiset and scale7",
    "preserved": "total1393",
    "changed": "internal prefixes",
    "evidence": "C839\u2013842"
  },
  {
    "mechanism": "source-fixed anchor change",
    "object": "original decimal spans",
    "held": "source date",
    "preserved": "declared one-pass rule",
    "changed": "digits, branch and endpoint gain",
    "evidence": "C852\u2013857"
  },
  {
    "mechanism": "intermediate grid",
    "object": "P/J word on6877",
    "held": "origin and final scalar product",
    "preserved": "final7000",
    "changed": "intermediate integer membership",
    "evidence": "C881\u2013882"
  },
  {
    "mechanism": "different held anchors",
    "object": "five-head E/P diagnostic",
    "held": "scalar product",
    "preserved": "scaled intervals",
    "changed": "constant absolute placement",
    "evidence": "C886\u2013887"
  },
  {
    "mechanism": "retained subdivision",
    "object": "147000 outer carrier",
    "held": "outer endpoints and source biography",
    "preserved": "outer total",
    "changed": "internal cut versus uniform transport",
    "evidence": "C898,906"
  }
]