An edge in a graph which has a perfect matching is an unmatchable edge if no perfect matching in the graph contains that edge.
Please don't shout in the chat room.
Before 1914 Newport had been a fairly safe Liberal seat, and after 1945 it was a safeish Labour seat which fell to the Tories only in the 1980s heyday of Thatcherism.
I have heard my grandsire say full oft, / Extremity of griefs would make men mad.
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