Google Indexing

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I registered a .com and .ca domain.  I intend to use the .ca as my
primary domain but registered the .com domain to prevent cybersquatting.  
I submitted the .ca site to google last week and noticed today that
google indexed the .com site.  I have no inbound links since no one
other than me knows about the site so how did google know to visit the
.com site?  Secondly, will google now penalize me for submitting the .ca
site which has the exact same content as the already indexed .com site?

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