You are a multilingual lexicographer. Output ONLY valid JSON. No markdown fences, no explanations, no commentary.

The following words are English nouns:
child
work
life
world
hand
eye
book
friend
school
city

For each word, generate ALL distinct senses (meanings). A word like "bank" has at least two senses (financial institution, river edge). A word like "house" may have two (building, dynasty). Most words have one.

For each sense, provide:
- sense_index: integer starting at 0
- definitions: array of 1-2 student-friendly definitions in English, max 15 words each
- examples: array of 1-2 natural sentences in English using the word in this sense
- difficulty: "easy", "medium", or "hard" (use the CEFR guide below)
- translations: object with keys "de", "it", "es", "fr" (exclude the source language). Each value is an array of translation objects.

Each translation object has:
- word: the translation
- gender: "masculine", "feminine", "neuter", or null (null ONLY for English or languages without grammatical gender for this word)
- difficulty: "easy", "medium", or "hard" — how difficult THIS specific translation word is for a learner. A common word like "Bank" is easy; a formal synonym like "Geldinstitut" is medium.

CEFR difficulty guide (for calibration, do not include CEFR levels in output):
- A1/A2 → easy (beginner, everyday vocabulary)
- B1/B2 → medium (intermediate, less common or more formal)
- C1/C2 → hard (advanced, rare, literary, or technical)

Output format: JSON object where keys are the input words, values are arrays of sense objects.

Example for the English noun "bank":
{
  "bank": [
    {
      "sense_index": 0,
      "definitions": ["An institution where one can deposit and borrow money."],
      "examples": ["She deposited her paycheck at the bank."],
      "difficulty": "easy",
      "translations": {
        "de": [
          {"word": "Bank", "gender": "feminine", "difficulty": "easy"},
          {"word": "Geldinstitut", "gender": "neuter", "difficulty": "medium"}
        ],
        "it": [{"word": "banca", "gender": "feminine", "difficulty": "easy"}],
        "es": [{"word": "banco", "gender": "masculine", "difficulty": "easy"}],
        "fr": [{"word": "banque", "gender": "feminine", "difficulty": "easy"}]
      }
    },
    {
      "sense_index": 1,
      "definitions": ["The land alongside a river or lake."],
      "examples": ["They picnicked on the bank of the river."],
      "difficulty": "medium",
      "translations": {
        "de": [{"word": "Ufer", "gender": "neuter", "difficulty": "medium"}],
        "it": [{"word": "riva", "gender": "feminine", "difficulty": "medium"}],
        "es": [{"word": "orilla", "gender": "feminine", "difficulty": "medium"}],
        "fr": [{"word": "rive", "gender": "feminine", "difficulty": "medium"}]
      }
    }
  ]
}

Rules:
- Definitions and examples MUST be in English.
- Every sense MUST have translations for all target languages.
- If a word is not a valid noun, include it with an empty array and add a top-level "_rejections" key explaining why.
- Do not invent senses. Only include meanings that are genuinely distinct.