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1: Bird abatement 2: Alaska 3: Maximum mid-expiratory flow rate 4: Soil 5: Range 6: Community 7: Periplaneta americana 8: Human 9: Feeder 10: Weed 11: Environment 12: Fishery 13: Function 14: Change 15: Process 16: Atmosphere 17: Contamination 18: Japan 19: Lead 20: Sulfuric acid rain (As of 05:30)