/usr/lib/debug/.build-id/1f/ 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/1f/08ce0d1ea25eeff43a529cdf61f348b233e249.debug
    
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                application/x-executable | root:root | 0o644 | 328.7 KB | 
                    
    
    
    /usr/lib/debug/.build-id/1f/cff21ea967a1b2a187e06ec6d0bdea15f0080b.debug
    
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                application/x-executable | root:root | 0o644 | 221.6 KB |