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    ServerName thiagoarrais.com
    ServerAlias thiagoarrais.com www.thiagoarrais.com blog.thiagoarrais.com

    RewriteCond %{HTTP_HOST} !^blog\.thiagoarrais\.com [NC]
    RewriteCond %{HTTP_HOST} !^$
    RewriteRule ^/(.*) blog.thiagoarrais.com$1 [R]