{
    "Healing salve": "progressive-salve",
    "Good healing salve": "progressive-salve",
    "Advanced purifier": "progressive-purifier",
    "Electric purifier": "progressive-purifier",
    "Medium crop plot": "progressive-crop-plot",
    "Large crop plot": "progressive-crop-plot",
    "Battery": "progressive-battery",
    "Battery charger": "progressive-battery",
    "Engine": "progressive-engine",
    "Steering Wheel": "progressive-engine",
    "Engine controls": "progressive-engine",
    "Storage": "progressive-storage",
    "Large Storage": "progressive-storage",
    "Zipline tool": "progressive-zipline",
    "Zipline": "progressive-zipline",
    "Smelter": "progressive-metals",
    "Metal detector": "progressive-metals",
    "Basic bow": "progressive-bow",
    "Stone arrow": "progressive-bow",
    "Metal arrow": "progressive-bow",
    "Vasagatan Frequency": "progressive-frequency",
    "Balboa Island Frequency": "progressive-frequency",
    "Caravan Island Frequency": "progressive-frequency",
    "Tangaroa Frequency": "progressive-frequency"
}