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1: Bird abatement 2: Alaska 3: Soil 4: Maximum mid-expiratory flow rate 5: Range 6: Community 7: Periplaneta americana 8: Weed 9: Feeder 10: Human 11: Change 12: Environment 13: Fishery 14: Japan 15: Contamination 16: Function 17: Process 18: Lead 19: Atmosphere 20: Electricity (As of 19:56)