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A tube or passageway in a building or machine for air, liquid, cables, etc
A long, narrow, typically vertical hole that gives access to a mine, accommodates a lift in a building, or provides ventilation
An important route in a system of roads, rivers, or railway lines
The route or direction followed by a ship, aircraft, road, or river
A fracture in rock containing a deposit of minerals or ore and typically having an extensive course underground
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