{
    "criteria": {
      "requirement": {
        "trigger": "minecraft:inventory_changed",
        "conditions": {
          "items": [
            {
              "item": "betteranimalsplus:boarhead_4",
              "count": 1
            },
            {
              "item": "betteranimalsplus:boarhead_3",
              "count": 1
            },
            {
              "item": "betteranimalsplus:boarhead_2",
              "count": 1
            },
            {
              "item": "betteranimalsplus:boarhead_1",
              "count": 1
            }
          ]
        }
      }
    }
  }