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1: Active solar heating system 2: Soil 3: Community 4: Lead 5: Feeder 6: Human 7: Range 8: Water 9: Current 10: Environment 11: Carbon 12: Process 13: Electricity 14: Fishery 15: Contamination 16: Atom 17: Condition 18: Plant 19: Hazard 20: Conservation (As of 00:26)