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