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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Atom 7: Lead 8: Current 9: Condition 10: Fishery 11: Process 12: Contamination 13: Water 14: Range 15: Human 16: Environment 17: Conservation 18: Electricity 19: Subdivision 20: Hazard (As of 13:53)