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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Range 6: Contamination 7: Fishery 8: Lead 9: Hazard 10: Carbon 11: Japan 12: Change 13: Electricity 14: Process 15: Water 16: Atmosphere 17: Current 18: Sample 19: Condition 20: Development (As of 02:07)