Last year google introduced the sitelinks for pages that seem to have very relevant content for the search query entered by the user. These sitelinks for those who are not yet familiar with sitelinks, are an extra set of links from the first listing in the serps that give the user extra topics, information from this top ranking site, an example can be found here , it seems that for the query cnn google thinks that cnn.com is so important that extra links from this site should be displayed.
More information about sitelinks can be found in this google site links article by John.
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