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How to read fsck output?

I want to understand the fsck output, I did not find it explained anywhere. The following it’s output of the fsck command on a luks encrypted ext4 drive (unmounted). What’s the (1993/0/0 errors) supposed to mean? What’s the fraction supposed to describe Files: clean, 633043/61046784 files, 143545156/244181760 blocks? If there’s any primary source with GRAPHICAL description of what each section of the output means please cite it. Thanks.

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