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/usr/share/doc/live-boot/examples/live-persistence.binds is in live-boot-doc 3.0~a24-1ubuntu1.

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# /etc/live-persistence.binds example
#
# If this file is present in the proper path, each uncommented not empty line
# will be treated as a directory which should not be made persistent and
# which it's content should be volatile.
#
# This is achieved by bind mounting on it a tmpfs clone of the directory specified

# Exclude some standard temporary paths
/tmp
/var/log
/var/cache

# Firefox profiles are not always useful to remember
/root/.mozilla