This article is from the Switzerland FAQ, by Marc Schaefer schaefer@alphanet.ch with numerous contributions by others.
Time spent as a student is definitely valid for residence when
applying for Swiss citizenship.
Also note that, if you apply for Swiss citizenship before 24, and
you are a male, you have great chances of doing the military
service.
With some countries (Italy, Germany, France), it is possible
to keep the original nationality under some conditions.
 
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