Finding anomalies between two lists

I was comparing a master drawing list with a list of hundreds PDFs getting delivered on a project.

I got the file list from CMD with this:
dir /s /b > c:\PDFs\dir.txt
Parsed out that text in Dynamo, etc…

Here is how to compare the lists for duplicates and mismatches:

This showed that one PDF was missing and one extra PDF existed.

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