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