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