You are building a new house. Your builder designs a beautiful foyer with a tiled 8-by-8 foot area constructed by one-foot square ceramic tiles. Upon inspection of the house, you notice that two of the one-foot tiles are cracked. If the cracks randomly occurred after the tile was laid, what is the probability that the two cracked tiles share a common edge with each other? In other words, the two cracked tiles are next to each other (but not diagonal)?