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1: Bird abatement 2: Soil 3: Community 4: Weed 5: Range 6: Periplaneta americana 7: Alaska 8: Maximum mid-expiratory flow rate 9: Japan 10: Feeder 11: Lead 12: Change 13: Contamination 14: Process 15: Function 16: Fishery 17: Development 18: Electricity 19: Atmosphere 20: Action (As of 17:44)