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