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1: Active solar heating system 2: Soil 3: Community 4: Lead 5: Range 6: Hazard 7: Feeder 8: Contamination 9: Fishery 10: Japan 11: Electricity 12: Change 13: Bird abatement 14: Atmosphere 15: Periplaneta americana 16: Carbon 17: Process 18: Weed 19: Water 20: Sample (As of 20:19)
