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Something is wrong with the of the matroid in the "Graphical Definitions" section. If this is a really a frame matroid, then there is a type of circuit that has not been described: the disjoint pairs of cycles with both gains not equal to 1, together with a path joining them. — Preceding unsigned comment added by Luis Goddyn (talk • contribs) 01:30, 28 July 2012 (UTC)