/usr/lib/debug/.build-id/83/ is in qtbase5-examples-dbg 5.2.1+dfsg-1ubuntu14.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/83/210003b27acf63ff645ebdfc9b8efa4d00b21b.debug
    
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                application/x-executable | root:root | 0o644 | 385.8 KB | 
                    
    
    
    /usr/lib/debug/.build-id/83/54c00d112d821de9ad8780ae0fb057cc8da667.debug
    
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                application/x-executable | root:root | 0o644 | 323.5 KB |