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I could impact on your OPT.
There is limited hours you can work under CPT. So if you work more than that
than it take some time from OPT.
I saw some people who had problem for getting OPT later on
because they use too much of CPT.
So be careful!
Go to International students office and find out correct informaiton. staff there.
or you might find some information at some university website.