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This is the fifth part of the Secondary Cipher Challenge.
If you want to work on a computer to solve the problem, you can download this cipher as a text file which doesn't contain any line breaks.
You can use the Cipher Challenge Toolkit to help you decipher it.
Once you've decrypted this message, you should have a keyword.
You can access Part 6 of the Cipher Challenge at http://nrich.maths.org/???
by replacing the ??? with the keyword.