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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Carbon 6: Range 7: Lead 8: Condition 9: Fishery 10: Water 11: Contamination 12: Atom 13: Current 14: Conservation 15: Electricity 16: Process 17: Human 18: Environment 19: Hazard 20: Plant (As of 07:33)