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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Fishery 6: Carbon 7: Range 8: Contamination 9: Lead 10: Water 11: Change 12: Electricity 13: Japan 14: Condition 15: Uptake 16: Current 17: Hazard 18: Process 19: Conservation 20: Atom (As of 09:28)