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1: Active solar heating system 2: Soil 3: Community 4: Weed 5: Bird abatement 6: Range 7: Lead 8: Feeder 9: Electricity 10: Hazard 11: Contamination 12: Japan 13: Change 14: Periplaneta americana 15: Process 16: Atmosphere 17: Fishery 18: Development 19: Action 20: Function (As of 17:24)