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A schematic diagram showing a cross section of the petrol tank. The entire shape is square, but the actual tank is a trapezoid, leaving a small triangular space at the front, with a hinge on that side allowing access. Inside the triangular space is a large container, or pocket.
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A schematic diagram showing a cross section of the two garages, separated by a wall, but with an underground pipe communicating between them. The pipe connects the inspection chamber and vent pipe of each garage in a straight line.