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1: Active solar heating system 2: Community 3: Soil 4: Range 5: Lead 6: Feeder 7: Hazard 8: Bird abatement 9: Contamination 10: Change 11: Electricity 12: Japan 13: Fishery 14: Weed 15: Atmosphere 16: Carbon 17: Periplaneta americana 18: Process 19: Development 20: Action (As of 22:08)
