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1: Active solar heating system 2: Soil 3: Community 4: Carbon 5: Lead 6: Feeder 7: Current 8: Water 9: Human 10: Process 11: Contamination 12: Range 13: Environment 14: Fishery 15: Condition 16: Electricity 17: Conservation 18: Atom 19: Subdivision 20: Hazard (As of 00:08)