{
  "items": [
    {
      "id": "i0",
      "value": 5
    },
    {
      "id": "i1",
      "value": 5
    },
    {
      "id": "i2",
      "value": 10
    }
  ],
  "target": 10,
  "model": {
    "value_model": "positive_exact_integers",
    "selection_model": "each_distinct_item_at_most_once",
    "target_model": "one_exact_nonnegative_integer",
    "additional_constraints": "none",
    "unit_model": "one_declared_integer_unit"
  }
}