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1: Active solar heating system 2: Soil 3: Community 4: Contamination 5: Feeder 6: Range 7: Lead 8: Hazard 9: Fishery 10: Japan 11: Carbon 12: Electricity 13: Change 14: Process 15: Atmosphere 16: Water 17: Sample 18: Periplaneta americana 19: Bird abatement 20: Coal (As of 17:21)
