what is the proper syntax for listing rules in john the ripper

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http://unix.stackexchange.com – I am trying to configure john the ripper to look for passwords that contain only vowels. Following this help page I have tried these lines in John.ini [List.Rules:Single] -: ?v //unknown command...trying to look for all vowel pws and [List.Rules:Single] ?v //unknown rule reject flag ... trying to look for all vowel pws this seems like a simple syntax issue but I am trouble setting up the configuation. Can anyone point me in the right direction? (HowTos)