{
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  "metadata": {
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      "width": 128
    }
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  "zoom": 2,
  "sprite": "local://sprites/emerald",
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            "properties": {
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    },
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      "source": "a",
      "paint": {
        "line-width": 10,
        "line-pattern": ["case", ["==", ["get", "class"], "street"], "generic_icon", "generic_metro" ]
      }
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}