Where do you get the "10" in the 10 commandments?

Originally posted 9/2/07, 12:05 AM, Eastern Daylight Time
How are the 10 commandments to be parsed [i.e. enumerated into different commandments] according to:

1. Hazal?
2. The Masoretic text - [two different answers?]
3. Wolf Heidenheim?

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