#18855: breadth_first_search return edges
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   Reporter:  chaoxu        |            Owner:
       Type:  enhancement   |           Status:  new
   Priority:  minor         |        Milestone:  sage-6.8
  Component:  graph theory  |         Keywords:
  Merged in:                |          Authors:
  Reviewers:                |  Report Upstream:  N/A
Work issues:                |           Branch:
     Commit:                |     Dependencies:
   Stopgaps:                |
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 There is no easy way to get the set of edges in a `breadth_first_search`
 traversal of the graph.
 What about an optional parameter so it also return a set of edges of some
 breadth first search?

 Similarly, for the other set of searches too.
 This is useful if there are information stored on the edges instead of
 vertices.

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Ticket URL: <http://trac.sagemath.org/ticket/18855>
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