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