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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Lead 6: Human 7: Range 8: Water 9: Current 10: Carbon 11: Process 12: Environment 13: Atom 14: Electricity 15: Contamination 16: Fishery 17: Condition 18: Plant 19: Conservation 20: Hazard (As of 03:40)
A Backhaul is a vehicle's return trip
