{
  "title": "Aluminum sheet and foil data for AI slit-coil and sample review",
  "source_page": "https://fiund.com/industries/aluminum-coil-slit-sample-location-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "Locate a parent coupon within its child coil",
    "context": "An original coil diagram defines half-open transverse intervals measured from a marked edge.",
    "records": [
      [
        "1",
        "Slit plan",
        "Child A covers [0,40) mm; B covers [40,70); C covers [70,100)."
      ],
      [
        "2",
        "Sample ticket",
        "Coupon spans [68,72) mm in the parent coordinate frame."
      ],
      [
        "3",
        "Lab index",
        "Result belongs to the intact parent coupon."
      ]
    ],
    "question": "Which child can claim the intact coupon result?",
    "answer": "Neither B nor C covers the whole coupon. Records 1 and 2 split its span at 70 mm: two millimeters in each child. Record 3 measures the intact coupon, not the pieces separately, so retain the result at parent-coupon scope.",
    "failureModes": [
      "Using the coupon center to assign the entire result",
      "Copying one combined measurement to both children"
    ],
    "fields": [
      [
        "parent_span_mm",
        "Records full specimen extent"
      ],
      [
        "slit_boundary",
        "Maps parent locations to children"
      ],
      [
        "result_scope",
        "Prevents inventing per-child results"
      ]
    ],
    "holdout": "Move a coupon's endpoint exactly to a slit boundary and use the half-open convention consistently.",
    "boundary": "No real slit schedules, commercial specs, plant records or conformity decisions."
  }
}