There are such rules:

one

RewriteCond %{REQUEST_URI} ^/%filename1%)$ [OR] RewriteCond %{REQUEST_URI} ^/(%filename2%)$ [OR] RewriteRule ^(.*)$ /seo/%1 [L,QSA] 

2 http part

 RewriteCond %{REQUEST_URI} ^/(%filename3%)$ [OR] RewriteCond %{REQUEST_URI} ^/(%filename4%)$ [OR] RewriteRule ^(.*)$ /seo/http/%1 [L,QSA] 

3 https part

 RewriteCond %{HTTP_X_FORWARDED_PROTO} https RewriteCond %{REQUEST_URI} ^/(%filename5%)$ [OR] RewriteCond %{REQUEST_URI} ^/(%filename6%)$ RewriteRule ^(.*)$ /seo/https/%1 [L,QSA] 

Question:
1) Can I merge into one RewriteRule?
2) Is the https protocol check done correctly?

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