1. Although payment companies'chief source of money is not deposits, they are eating into that part of banks'business.
2. The Maghreb countries have attracted little more than a trickle of foreign investment, and the chief source has been Europe.
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3. The US missile defense plan has been vociferously opposed by Russia and has become a chief source of tension between the two countries.
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4. Blogs were considered the " coolest " modern communication medium, but magazines remained popular and the chief source of fashion information.