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If you simply want visitors be redirected to the same website (the main domain), set up a 301 redirect with a .htaccess file for all but the main domains.
Generally, this will tell the SEs where the content is.
Essentially, this won't let them index the other sites.
Another issue, though, is having the same content on all of the domains without redirects - then most of them will be filtered from the results.
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