{
  "nature": "original fictional teaching case",
  "promised_orders": 100,
  "late_orders": 20,
  "classification_rule": "first recorded blocker per order, not exclusive real-world causes",
  "branches": [
    {"label": "库存确认", "count": 8},
    {"label": "补充地址", "count": 5},
    {"label": "截单时间", "count": 4},
    {"label": "揽收安排", "count": 3}
  ],
  "inventory_subset": {"manual_lookup": 6, "unexplained": 2},
  "hypotheses": ["update timing", "stock reservations"],
  "unknown": "The evidence does not yet establish the cause of the stock discrepancy."
}