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SEO www redirects in htaccess (code included)

How about this to help improve SEO. Will require hand editting to enable correct rule and domain name. I have this running my my site without problem.

Needs to be the first rewrite rule in the list.

# redirect all to http://www.example.com/...
#
RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]
#
# redirect http://www.example.com/... to http://example.com/...
#
# RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
# RewriteRule ^(.*)$ http://example.com/$1 [L,R=301]


:)