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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Lead 7: Current 8: Process 9: Range 10: Water 11: Fishery 12: Human 13: Contamination 14: Condition 15: Atom 16: Environment 17: Electricity 18: Conservation 19: Subdivision 20: Hazard (As of 13:45)