Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
/app/repo is a Git repository. A developer accidentally deleted a commit containing important information. Use git reflog to find the deleted commit and retrieve the flag in its commit message. Hint: git reflog shows the history of operations
Check HEAD movement history with git reflog
Once you find the deleted commit hash, use git show <hash>
The commit message contains "FLAG:"