I have never used .gss and have not tested the following, but just looking at the documentation on the page seems to imply that including a few of them would be the following:
java -jar closure-stylesheets.jar --pretty-print first.gss java -jar closure-stylesheets.jar --pretty-print second.gss
Although it seems to be easier to use the minimization technique shown on the page:
java -jar closure-stylesheets.jar first.gss second.gss third.gss
Try either of these two methods on your site, or see if your question solves your question.
ScottS
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