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1: Active solar heating system 2: Community 3: Soil 4: Range 5: Lead 6: Hazard 7: Feeder 8: Change 9: Electricity 10: Contamination 11: Japan 12: Fishery 13: Bird abatement 14: Atmosphere 15: Process 16: Weed 17: Carbon 18: Periplaneta americana 19: Development 20: Water (As of 02:22)
