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When General Motors Corp.’s top executives were choosing this year which brands to keep and which to ditch, Cadillac was unquestionably deemed to be a valuable asset that should be part of a new GM.The most iconic of GM’s brands, Cadillac is known worldwide. In its heyday, it rolled out some of the most beautiful cars ever built, the fin-tailed sedans of the ’50s and ’60s that symbolized American