“Sentence passports” stamped after every sentence to track your confusion index

{
  "input": {
    "prompt": " Close-up photo of a small passport-like booklet titled “Sentence Passport.” A gloved official hand stamps it repeatedly; each stamp has a tiny icon (speech bubble) and a number labeled “Confusion Index.” The page is crowded with stamps, and a small ink pad and queue-number ticket are visible on the counter."
  }
}