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1: Active solar heating system 2: Soil 3: Community 4: Lead 5: Carbon 6: Feeder 7: Water 8: Current 9: Human 10: Process 11: Contamination 12: Range 13: Fishery 14: Environment 15: Condition 16: Electricity 17: Conservation 18: Atom 19: Subdivision 20: Hazard (As of 20:48)
