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