When is comes to actually parsing the addresses, there are a seemingly innumerable amount of issues that come up, and in certain locations the epic problem is non-E911 compliant addresses. More information on E911, or Enhanced-911 is available here (http://en.wikipedia.org/wiki/Enhanced_9-1-1), but in short it is a system of standardizing addresses to provide more location information to 911 responders, a side effect of which is cleaner, geocodable addresses.
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