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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Range 6: Contamination 7: Lead 8: Fishery 9: Hazard 10: Japan 11: Change 12: Carbon 13: Electricity 14: Water 15: Process 16: Atmosphere 17: Sample 18: Periplaneta americana 19: Bird abatement 20: Environment (As of 17:31)