Duplicated Pages listed by google - .htaccess problem?

Hi, google has listed quite a lot of my pages twice (disaster). Some with trailing slash (/) and some without. The redirect should redirect to URL without/

Could someone take a look and let me know if it's right or wrong? The redirect works as it will redirec url/ to url for me but obviously is not for google.

I see that some URL in the .htaccess have / and some do not. Is this confusing the redirect?

#redirects from old site
redirect 301 /example1.htm http:// www. mytopsecretdomain.net/example1/
redirect 301 /example2.htm http:// www. mytopsecretdomain.net/
redirect 301 /example3.htm http:// www. mytopsecretdomain/example3/
redirect 301 /example4.htm http:// mytopsecretdomain/example4/
redirect 301 /example5.htm http:// mytopsecretdomain/example5/
redirect 301 /example6.htm http:// mytopsecretdomain/example6/

redirect 301 /site-map3.xml http:// mytopsecretdomain/about-us/blog-sitemap/
redirect 301 /contact.php http:// mytopsecretdomain/contact-us/
redirect 301 /blog/ /about-us/blog/

RedirectMatch 301 ^/example10(.*) http:// www. mytopsercetdomain.net/example10/
RedirectMatch 301 ^/example11(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example12(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example13(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example14(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example15(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example16(.*) http:// www. mytopsecretdomain.net
RedirectMatch 301 ^/example17(.*) http:// www. mytopsecretdomain.net/example17/
RedirectMatch 301 ^/example18/(.*) http:// www. mytopsecretdomain.net/example18/

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Code (markup):