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1: Bird abatement 2: Alaska 3: Soil 4: Range 5: Maximum mid-expiratory flow rate 6: Community 7: Weed 8: Periplaneta americana 9: Feeder 10: Change 11: Human 12: Lead 13: Environment 14: Fishery 15: Japan 16: Contamination 17: Function 18: Process 19: Electricity 20: Atmosphere (As of 08:19)
