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"This is reading a random line from the file. Though the same line is used if this macro is used more than once on a submission with the same file. As alternative you can also use a directory instead of a a file. Than a random file from that directory is used.
Example: My name is %spinfile-names.dat% %spinfile-lnames.dat%. Output: My name is Earl Grey.
The example above is using the macro two times but on different files (so it is always using a random line, just when you later use the %spinfile-names.dat or %spinfile-lnames.dat% on the same site it is using the same content)."