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G is said to be bipartite matching extendable(BM-extendable) if every matching M whose induced subgraph is a bipartite graph extends to a perfect matching of G. 稱G是偶匹配可擴(kuò)的，如果G中導(dǎo)出子圖是偶圖的匹配M都可以擴(kuò)充為G的完美匹配。