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Hello Debora,
Make sure you keep copies of your .htaccess files before you make changes and, if you can, use a test site to test your changes first before you make changes on your live website.
I'm not sure how your website is set up so I don't know if combining the two files will accomplish what you are looking for.
Whatever you do, make sure you have backups.
Try here. Maybe that will help.
Edit: Pretty sure it's your root directory .htaccess file that is causing the looping. I'd start with that.