RewriteRule (.+)/feed /$1 [R=301,L]
RewriteRule (.+)/comment-page /$1 [R=301,L]
RewriteRule (.+)/trackback /$1 [R=301,L]
RewriteRule (.+)/comments /$1 [R=301,L]
RewriteRule (.+)/attachment /$1 [R=301,L]
RewriteCond %{QUERY_STRING} ^replytocom= [NC]
RewriteRule (.*) $1? [R=301,L]
RewriteCond %{QUERY_STRING} ^attachment_id= [NC]
RewriteRule (.*) $1? [R=301,L]