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