Combining Groups

Chris <[email protected]>
Newsgroups gmane.mail.ifile.general
Message-ID <[email protected]> 
Greetings: 
I was classifying some mail and instead of using spam/nonspam, I 
accidentally used nospam. How do I combine the nospam and the nonspam 
groups? There's no reason for me to have three groups. 
Thanks Chris
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