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                  "minecraft:calcite"
                ]
              },
              {
                "type": "minecraft:matching_blocks",
                "offset": [
                  0,
                  -1,
                  0
                ],
                "blocks": [
                  "minecraft:amethyst_block",
                  "minecraft:calcite"
                ]
              }
            ]
          }
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}
