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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Lead 7: Range 8: Atom 9: Condition 10: Current 11: Contamination 12: Fishery 13: Water 14: Process 15: Electricity 16: Human 17: Conservation 18: Environment 19: Plant 20: Hazard (As of 20:54)