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1: Active solar heating system 2: Soil 3: Community 4: Carbon 5: Feeder 6: Lead 7: Current 8: Water 9: Human 10: Process 11: Range 12: Contamination 13: Atom 14: Environment 15: Fishery 16: Condition 17: Electricity 18: Conservation 19: Subdivision 20: Hazard (As of 07:37)
