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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Range 6: Carbon 7: Fishery 8: Contamination 9: Lead 10: Change 11: Electricity 12: Water 13: Japan 14: Process 15: Hazard 16: Current 17: Condition 18: Uptake 19: Conservation 20: Atmosphere (As of 00:26)
