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1: Active solar heating system 2: Bird abatement 3: Community 4: Soil 5: Weed 6: Range 7: Japan 8: Feeder 9: Lead 10: Periplaneta americana 11: Contamination 12: Process 13: Change 14: Electricity 15: Function 16: Atmosphere 17: Fishery 18: Action 19: Development 20: Hazard (As of 19:49)