{
  "tiers": [
    {
      "trades": [
        {
          "wants": [
            {
              "item": "minecraft:string",
              "quantity": {
                "min": 15,
                "max": 20
              }
            }
          ],
          "gives": [
            {
              "item": "minecraft:emerald"
            }
          ]
        },
        {
          "wants": [
            {
              "item": "minecraft:emerald"
            }
          ],
          "gives": [
            {
              "item": "minecraft:arrow",
              "quantity": {
                "min": 8,
                "max": 12
              }
            }
          ]
        }
      ]
    },
    {
      "trades": [
        {
          "wants": [
            {
              "item": "minecraft:gravel",
              "quantity": 10
            },
            {
              "item": "minecraft:emerald",
              "quantity": 1
            }
          ],
          "gives": [
            {
              "item": "minecraft:flint",
              "quantity": {
                  "min": 6,
                  "max": 10
                }
            }
          ]
        },
        {
          "wants": [
            {
              "item": "minecraft:emerald",
              "quantity": {
                "min": 2,
                "max": 3
              }
            }
          ],
          "gives": [
            {
              "item": "minecraft:bow"
            }
          ]
        }
      ]
    }
  ]
}