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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Atom 7: Lead 8: Current 9: Contamination 10: Range 11: Fishery 12: Condition 13: Process 14: Water 15: Human 16: Environment 17: Conservation 18: Electricity 19: Change 20: Hazard (As of 04:09)
