One week prior to its official grand opening, Wacky Wild Fun Park invited 200 teenagers to a complimentary "sneak preview Saturday" of all that the amusement park has to offer- its rides, food and entertainment. At the end of the day, as each teen passed through the exit gate, park employees gave each guests five Wacky Wild Key chains to pass on to their friends. Park employees also reminded the departing guests to tell their friends about all the fun they had at the amusement park. This is an example of:

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