/usr/lib/debug/.build-id/42/ 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/42/73694e04248d938d7fe2b1e5913a66d9c92684.debug
    
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                application/x-executable | root:root | 0o644 | 440.4 KB | 
                    
    
    
    /usr/lib/debug/.build-id/42/d26f34f301e57bdef454d48bf33b29fc31a3b9.debug
    
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                application/x-executable | root:root | 0o644 | 576.2 KB | 
                    
    
    
    /usr/lib/debug/.build-id/42/e20d7785cc8399d33735315b58c37bb3847320.debug
    
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                application/x-executable | root:root | 0o644 | 329.7 KB | 
                    
    
    
    /usr/lib/debug/.build-id/42/e54cd4973da990d1f915124bf6e5eb279ab903.debug
    
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