You can use the `git blame` command to see who most recently changed a specific line in a file. Here's how you can use it to see who last changed line 222 of the file `src/app.py`:

```
git blame -L 222,222 src/app.py
```

This command will show you the commit hash, author name, and date for the last change made to line 222 of the `src/app.py` file.
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