RewriteEngine On    # Turn on the rewriting engine
RewriteCond %{http_host} ^www.example.info [nc] #if url starts with www.example.info
RewriteRule ^(.*)$ http://example.info/$1 [r,nc] #rewrite without the www

RewriteCond %{http_host} ^www.(.*).example.info [nc] #if url starts with www.(aff).example.info
RewriteRule ^(.*)$ http://%1.example.info/$1 [r,nc] #rewrite without the www

RewriteCond %{HTTP_HOST} !^www\.  [NC]
RewriteCond %{http_host} ^(.*)\.example.info [nc] #if subdomain is aff
RewriteRule ^(.*)$ - [co=aff:%1:example.info:7200:/] #drop/update cookie with aff

RewriteCond %{HTTP_HOST} !^www\.  [NC]
RewriteCond %{http_host} ^(.*)\.example.info [nc] #if subdomain is aff
RewriteRule ^(.*)$ http://example.info/$1 [nc,R,L] #rewrite without subdomain