> 2) At its very bottom, Git implements the so-called 
> "content-addressable filesystem".  Its chief principle is that every 
> unique piece of data is stored exactly once, and these pieces are 
> identified by their contents.  Since use the contents "as is" is 
> unwieldy, its being addressed using -- again -- the cryptographic hashes 
> calculated over those contents.  This what makes Git effectively 
> implement its paradigm where each commit refers to a complete state of 
> all the project's files: even though like 99.9% of the content of each 
> commit a typical big project is the same as its parent commit, each 
> unique chunk of information -- a file or a tree referring to a set of 
> files -- is stored in the repository exactly once. 

Content addressable filesystem. Nicely put. So, sort of content addressable 
memory (CAM) where contents are unique.

Thanks a lot, 

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