> While the Upshot mobile app used some pre-existing code, this did not violate the rules. Use of pre-existing code was allowable as long as the code didn’t comprise the majority of the app and didn’t violate any third party’s rights. Our internal review determined that Upshot’s mobile app was created during the hackathon and met these criteria.

So what does "a majority" really mean? Can I come in with 49% of the code and still be eligible? 49% isn't technically a majority. What about 49.99%? How do you even determine the concept of "a majority"?