Added methods to obtain arcs from edges in undirected graphs.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2012-01-31 21:31:14
Author local date 2012-01-31 22:31:14 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2012-01-31 21:31:14
Committer local date 2012-01-31 22:31:14 +0100
Commit 81fac775b56038c14d5559858005c71cf4f78aed
Tree 2c5eb7c9f5db2118e36825e0fefafc2b4d8f7216
Parent c5d7104e5557f6f1bbf6c514ffb32334e67a9f0c
Added methods to obtain arcs from edges in undirected graphs.
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