/usr/share/doc/flex/examples/manual/eof_test02.txt is in flex 2.6.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | INCLUDE #2
This is the second file that will
be included.
>>> Foo are GNU?
#include "eof_test03.txt"
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