Not all the sandwiches RH Foster makes and sells at its chain of Exxon-Mobile convenience stores in Maine are triple deckers, but labeling them for sale was always a laborious three-step process. Once sandwiches were made and wrapped, the store clerk would apply a preprinted label that identified the sandwiches and its ingredients. The clerk would then grab a labeling gun to set and produce the price label. Finally, the clerk would take

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