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1: Active solar heating system 2: Soil 3: Community 4: Range 5: Bird abatement 6: Lead 7: Weed 8: Hazard 9: Feeder 10: Contamination 11: Electricity 12: Change 13: Fishery 14: Japan 15: Atmosphere 16: Process 17: Carbon 18: Development 19: Periplaneta americana 20: Action (As of 21:25)