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