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I am reading this tutorial, and run into the following statement:

This is an SHA-1 checksum of the commit’s contents, which ensures that the commit will never be corrupted without Git knowing about it.

I don't know undetstand this sentence clearly, especially "... without Git knowing about it". Could anyone help to explain it?

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The way "without" is normally used in such constructions, you can "invert" the sentence to understand the meaning better. "No a without b" is often equivalent to "if a, then b." So your example becomes:

This is an SHA-1 checksum of the commit’s contents, which ensures that if a commit is ever corrupted, Git will know about it.

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