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