NOTICE:
Unfortunately, this post has been rendered invalid and kit kat claims no direct mutual partnership has been made official. Case rested.
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These days the idea of cross selling becomes so integral, so easy and so natural. My favorite toy, Lego now has a Kit Kat edition. Building it around the idea of having a break from using Lego, it successfully integrates the fun element within the candy. And it allows people to build more than one single design.