Sometimes, for short simple substitution ciphers, a wordpattern match can be very helpful.
This is a web interface for the wordpattern tool by Paul Andrew Johnston, called wordpat.
You can also enter a string like "xbvx", and this script will compute the pattern for you.
Currently this web interface supports 3 languages: english, german and french.

You can also download and look at the patterns here.

Happy challenging
gizmore

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