apache rewrite rule with parameters -

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i have following url:

http://www.domain.com/results.php?state=wa&city=seattle&sub=algebra

i appear as:

http://www.domain.com/results/wa/seattle/algebra

and...

http://www.domain.com/results.php?state=wa&city=seattle

as

http://www.domain.com/results/wa/seattle

i figure write first as:

rewriterule ^results/(.*)/(.*)/(.*)$  /results.php?state=$1&city=$2&sub=$3 [l]

but i'm stuck figuring out how combine both of them... slashes throwing me. suggestions?

rewriterule ^results/([^/]+)/([^/]+)/([^/]+)$  /results.php?state=$1&city=$2&sub=$3 [l] rewriterule ^results/([^/]+)/([^/]+)$ /results.php?state=$1&city=$2

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