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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Fishery 6: Carbon 7: Range 8: Lead 9: Contamination 10: Water 11: Change 12: Electricity 13: Japan 14: Condition 15: Uptake 16: Hazard 17: Current 18: Process 19: Environment 20: Conservation (As of 10:54)
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