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From: Rokia <Rokia@yahoo.com.cn.discuss>
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Subject: Re: how to delete a line without putting them into yanking?
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:(

I add this:   (global-set-key (kbd "C-c d") 'delete-line)

when I press "C-c d" , I got this prompt:

Symbol's defination is void :delete-line

what's wrong. need I install some additional library?