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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Carbon 6: Fishery 7: Range 8: Contamination 9: Lead 10: Water 11: Condition 12: Uptake 13: Current 14: Conservation 15: Electricity 16: Atom 17: Change 18: Process 19: Environment 20: Hazard (As of 11:48)