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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Range 7: Fishery 8: Condition 9: Lead 10: Contamination 11: Water 12: Atom 13: Electricity 14: Current 15: Conservation 16: Process 17: Human 18: Change 19: Environment 20: Hazard (As of 14:51)