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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Range 7: Fishery 8: Contamination 9: Lead 10: Change 11: Water 12: Electricity 13: Japan 14: Hazard 15: Process 16: Current 17: Condition 18: Uptake 19: Atmosphere 20: Conservation (As of 17:38)