htaccess without change actual url php

I have few urls like
http://www.mydomain.com/statecode1-folder1
http://www.mydomain.com/statecode2-folder1

I want to redirect it to http://www.mydomain.com/folder1/ page but I want to show on browser url the original urls likes
http://www.mydomain.com/statecode1-folder1
http://www.mydomain.com/statecode2-folder1

Please note that I do not have folders statecode1-folder1 and statecode2-folder1
Currently I use the below .htaccess which redirects but it changes the address bar

#Options +FollowSymlinks
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^/ statecode1-folder1 $
RewriteRule ^(.+) / folder1 [L]
RewriteCond %{REQUEST_URI} ^/ statecode2-folder1 $
RewriteRule ^(.+) / folder1 [L]
Thanks in Advance

Regards
Salman Ansari

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