How to open db diagram in visual 2013?

Question

SQL

I can’t find where to open the database diagram, for other people (in 2010 and 2008 versions) it is shown here: under the name of the “folder” Diagram database, I have the same as in the screenshot:
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There was a hypothesis that they simply do not exist, but there are doubts about this, because. she would be but empty inside.
In general, tell me what you know.