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1: Active solar heating system 2: Soil 3: Community 4: Human 5: Feeder 6: Lead 7: Water 8: Environment 9: Range 10: Current 11: Condition 12: Atom 13: Process 14: Electricity 15: Carbon 16: Contamination 17: Fishery 18: Hazard 19: Plant 20: Conservation (As of 03:01)