Using the Canadian postal code system as an example, the top level's binding concept is the postal district, and consists of 18 objects (letters). The next level down is the zone, where the objects are the digits 0â9. This is an example of an overlapping hierarchy, because each of these 10 objects has 18 parents.
The refreshed 2014 Buick Regal GS can now be had with all-wheel drive, though the added grip does come at the expense of a few horsepower. We already sampled the 2014 Regal GS and walked away mostly impressed, but now itâs time to verify how the sedanâs powertrain changes affect its performance numbers.
By 1967, Buick was making quiet history with more conventional V8s that had abandoned the nailhead design but made much greater power. For the 1967 model year, Buick renamed its  Gran Sport  performance models (not to be confused with the Chevrolet Super Sport cars) as GS models. In 1970 this was headed up by the powerful GS455 Stage 1, so named for its 455 cu in (7.5 L) engine, with its high performance Stage 1 package.