how to duplicate "columns" in a file

[email protected] Thu, 16 May 2013 20:17:15 +0200 (CEST)

Newsgroups	gmane.editors.sed.user
Message-ID	<trinity-48652129-01d7-41cc-b72a-07c1f9a9d314-1368728235894@3capp-gmx-bs35>

Hi all,
 
hope you can help me with how to duplicate "columns" in a file:
 
before:
 
aaa
bbb
ccc
 
 
after:
 
aaa aaa
bbb bbb
ccc ccc
 
 
Thanks in advance, 
Magnus

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