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1: Active solar heating system 2: Soil 3: Community 4: Contamination 5: Lead 6: Feeder 7: Range 8: Hazard 9: Fishery 10: Japan 11: Change 12: Carbon 13: Electricity 14: Process 15: Water 16: Atmosphere 17: Sample 18: Periplaneta americana 19: Bird abatement 20: Coal (As of 22:35)