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Now we'll get technical

Every commit, and indeed every version of every file, is assigned an ID number

The ID number is a 160-bit number derived from the object's contents

Git jargon: the ID number is called the object's hash or sometimes SHA

You can always refer to an object by its ID number

For example:

        git checkout 06e5d848f506564975199164a902af7180e987be
        git show --raw 06e5d848f506564975199164a902af7180e987be

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