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/usr/lib/jvm/java-7-openjdk-amd64/docs is in openjdk-7-jre-headless 7u51-2.4.6-1ubuntu4.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/jvm/java-7-openjdk-amd64/../../../share/doc/openjdk-7-jre-headless