/usr/lib/debug/.build-id/15/ is in libqt4-dbg 4:4.8.7+dfsg-11.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/15/8a91af6fbca9c7d75ed176b2b1f988c194b834.debug
    
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