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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Lead 7: Atom 8: Current 9: Condition 10: Range 11: Water 12: Fishery 13: Contamination 14: Process 15: Conservation 16: Human 17: Environment 18: Electricity 19: Plant 20: Change (As of 20:44)
