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I know Nate said something about this but I'll clarify a bit more.
The file cards aren't something such as in a library shelf of cards. They are used to clean out metal files (to grind down pieces of metal). A note card wouldn't improve traction, but I'm sure they are legal.
In the past, all games (except the very first one) have been played on a specific type of carpet. I don't know a part number or anything but keep that in mind when thinking of ways to gain traction while you build. (i.e. note cards have a very flat surface and don't mesh at all with carpet, therefore almost no traction other than the weight of your bot).
Read through in the 'Technical' forums here, you may get inspired
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