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1: Active solar heating system 2: Soil 3: Community 4: Human 5: Feeder 6: Water 7: Lead 8: Environment 9: Range 10: Condition 11: Process 12: Current 13: Contamination 14: Atom 15: Electricity 16: Carbon 17: Plant 18: Fishery 19: Hazard 20: Conservation (As of 00:00)
