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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Lead 7: Atom 8: Contamination 9: Current 10: Water 11: Fishery 12: Condition 13: Range 14: Process 15: Human 16: Conservation 17: Environment 18: Electricity 19: Change 20: Plant (As of 18:43)
