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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Range 7: Lead 8: Water 9: Current 10: Contamination 11: Condition 12: Atom 13: Fishery 14: Conservation 15: Electricity 16: Process 17: Environment 18: Human 19: Hazard 20: Plant (As of 11:02)