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It says everything you need to know about the ferocity of the rivalry between Manchester United and Liverpool that even though the two sides have very rarely been on an even keel, it has never lost its edge.
There is usually a clear favourite - whether it's Shankly's Liverpool or Ferguson's United - but whenever the two sides meet, there is a level of bitterness in the air that usually supersedes the surrounding circumstances.
When Liverpool face Manchester United, the derby takes precedence to everything else, and here are six historic clashes which best summarise English football's crown jewel.