Whats Wrong with this .htaccess and mod_rewrite???

A little background of my setup.

I have a site running a Wordpress Blog that is using pretty URLS.
And i have a folder underneath the root of the blog called /build with a /build/build.php file in it.

Now the user should never see the build.php but an array of urls such as
site.com/build/XXXXX/
site.com/build/YYYYY/
...
...

Here is my .htaccess currently (wordpress default)

Options +FollowSymlinks
RewriteEngine On

RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]

Code (markup):

And this is my build .htaccess code

RewriteRule ^build/([^/]*).html$ /build/build.php [L]
RewriteRule ^build/clear$ /build/build.php?act=clearbracket [L]
RewriteRule ^build/clear/$ /build/build.php?act=clearbracket [L]
RewriteRule ^build/clear/([^/]*)$ /build/build.php?act=clearbracket [L]

RewriteRule ^build/([^/]*)/([^/]*)/Undo$ /build/build.php?d=$1&gid=$2&act=undo [L]
RewriteRule ^build/([^/]*)/([^/]*)/Undo/$ /build/build.php?d=$1&gid=$2&act=undo [L]

RewriteRule ^build/([^/]*)/([^/]*)/([^/]*)/$ /build/build.php?d=$1&tid=$3&gid=$2&act=next [L]
RewriteRule ^build/([^/]*)/([^/]*)/([^/]*)$ /build/build.php?d=$1&tid=$3&gid=$2&act=next [L]

RewriteRule ^build/([^/]*)/$ /build/build.php?d=$1 [L]
RewriteRule ^build/([^/]*)$ /build/build.php [L]

Code (markup):

but when i join them i get a 500 server error.

This is them together

Options +FollowSymlinks
RewriteEngine On

RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d




RewriteRule ^build/([^/]*).html$ /build/build.php [L]
RewriteRule ^build/clear$ /build/build.php?act=clearbracket [L]
RewriteRule ^build/clear/$ /build/build.php?act=clearbracket [L]
RewriteRule ^build/clear/([^/]*)$ /build/build.php?act=clearbracket [L]

RewriteRule ^build/([^/]*)/([^/]*)/Undo$ /build/build.php?d=$1&gid=$2&act=undo [L]
RewriteRule ^build/([^/]*)/([^/]*)/Undo/$ /build/build.php?d=$1&gid=$2&act=undo [L]

RewriteRule ^build/([^/]*)/([^/]*)/([^/]*)/$ /build/build.php?d=$1&tid=$3&gid=$2&act=next [L]
RewriteRule ^build/([^/]*)/([^/]*)/([^/]*)$ /build/build.php?d=$1&tid=$3&gid=$2&act=next [L]

RewriteRule ^build/([^/]*)/$ /build/build.php?d=$1 [L]
RewriteRule ^build/([^/]*)$ /build/build.php [L]




RewriteRule . /index.php [L]

Code (markup):

I think i have some stuffi n the wrong order. can you help?

 

nvm i got it working