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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Lead 6: Human 7: Water 8: Environment 9: Range 10: Current 11: Carbon 12: Condition 13: Process 14: Atom 15: Fishery 16: Electricity 17: Contamination 18: Plant 19: Conservation 20: Hazard (As of 05:59)
