[
  {
    "input": [
      [
        { "quantity": 21, "item": "Bowling Ball" },
        { "quantity": 2, "item": "Dirty Sock" },
        { "quantity": 1, "item": "Hair Pin" },
        { "quantity": 5, "item": "Microphone" }
      ],
      [
        { "quantity": 2, "item": "Hair Pin" },
        { "quantity": 3, "item": "Half-Eaten Apple" },
        { "quantity": 67, "item": "Bowling Ball" },
        { "quantity": 7, "item": "Toothpaste" }
      ]
    ],
    "output": [
      { "quantity": 88, "item": "Bowling Ball" },
      { "quantity": 2, "item": "Dirty Sock" },
      { "quantity": 3, "item": "Hair Pin" },
      { "quantity": 3, "item": "Half-Eaten Apple" },
      { "quantity": 5, "item": "Microphone" },
      { "quantity": 7, "item": "Toothpaste" }
    ]
  }, 
  {
    "input": [
      [
        { "quantity": 0, "item": "Bowling Ball" },
        { "quantity": 0, "item": "Dirty Sock" },
        { "quantity": 0, "item": "Hair Pin" },
        { "quantity": 0, "item": "Microphone" }
      ],
      [
        { "quantity": 1, "item": "Hair Pin" },
        { "quantity": 1, "item": "Half-Eaten Apple" },
        { "quantity": 1, "item": "Bowling Ball" },
        { "quantity": 1, "item": "Toothpaste" }
      ]
    ],
    "output": [
      { "quantity": 1, "item": "Bowling Ball" },
      { "quantity": 0, "item": "Dirty Sock" },
      { "quantity": 1, "item": "Hair Pin" },
      { "quantity": 1, "item": "Half-Eaten Apple" },
      { "quantity": 0, "item": "Microphone" },
      { "quantity": 1, "item": "Toothpaste" }
    ]
  }
]