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