Branching Noob Question

This is particularly remedial, I know (I almost hate to ask the
question), but I can't quite understand what I'm doing wrong. I'm
trying to create a branch from the trunk and, after the branch is
complete, the branch includes the trunk directory. Using this command

svn cp -m "Creating a 3.5.5 maintenance branch"
http://example.com/repos/myrepos/trunk/
http://example.com/repos/myrepos/branches/maint/3.5.5/

I end up with the following:

example.com/branches/maint/currentversion/trunk

What I want, of course, is for the /trunk level to go away and its
contents to live directly beneath the /currentversion directory. I'm
new to Subversion (obviously), but I've done this before with the
expected results. I guess I just got lucky, though, because I have no
idea what I did differently.

Thanks for your help.

-- 
Rob Wilkerson
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