Stride, the four-year-old brand from Cadbury, has brought the idea to life with the introduction of Stride Shift, two gum varieties that change flavors, called Berry-to-Mint and Citrus-to-Mint.  In a recent television commercial for Stride Shift by the New York office of JWT, part of WPP, a focus group of young people is gathered around a conference room table when a voice over an intercom tells them to proceed.
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