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1: Active solar heating system 2: Community 3: Soil 4: Range 5: Bird abatement 6: Weed 7: Feeder 8: Lead 9: Electricity 10: Hazard 11: Contamination 12: Change 13: Japan 14: Process 15: Periplaneta americana 16: Fishery 17: Atmosphere 18: Development 19: Action 20: Function (As of 17:38)