{
  "documents": [
    "The northern lights, or aurora borealis, occur when charged particles from the solar wind interact with gases in the upper atmosphere.",
    "User passwords should be stored as salted hashes produced by a password hashing function such as Argon2, rather than as plaintext.",
    "Penguins gather in dense huddles to conserve body heat and reduce exposure to freezing Antarctic winds.",
    "A library catalog maps a book identifier to its shelf location and availability so patrons can find the correct volume."
  ],
  "queries": [
    "What atmospheric phenomenon produces the northern lights?",
    "How can a developer safely store user passwords?",
    "Why do penguins huddle together in cold weather?",
    "How can a library book be located by its catalog identifier?"
  ]
}