#20499: Graphs: docstring of _add_ conflicts with function
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       Reporter:  jmantysalo    |        Owner:
           Type:  defect        |       Status:  needs_info
       Priority:  major         |    Milestone:  sage-7.2
      Component:  graph theory  |   Resolution:
       Keywords:                |    Merged in:
        Authors:                |    Reviewers:
Report Upstream:  N/A           |  Work issues:
         Branch:                |       Commit:
   Dependencies:                |     Stopgaps:
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Comment (by jmantysalo):

 It seems that example given uses consecutive integeres. But yes, your
 suggestions sounds reasonable. But now I see this:

 {{{
 sage: G = Graph({'a': ['b']})
 sage: G
 Graph on 2 vertices
 sage: G+G
  disjoint_union : Graph on 4 vertices
 sage: H = graphs.CycleGraph(3)
 sage: H
 Cycle graph: Graph on 3 vertices
 sage: H+H
 Cycle graph disjoint_union Cycle graph: Graph on 6 vertices
 }}}

 Maybe the `__str__` needs modification also.

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Ticket URL: <http://trac.sagemath.org/ticket/20499#comment:3>
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