{
  "after": "C287",
  "chosen_next_step": "C288: enumerate source-supported paths and contrast them with abstract integer combinations of K widths.",
  "reason": "The reduced normal form invites iteration and lattice claims; testing its actual finite domains will prevent unsupported K or4K edges from being inferred.",
  "next_step_executed_within_this_step": false,
  "effort": "High sufficient",
  "limits": [
    "A comparison matrix is not a physical two-dimensional chronology.",
    "The4K width difference is not itself an admitted event separation here.",
    "Co-located LXX/SP labels remain separate source identities."
  ]
}