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