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61. The method of claim 54, further comprising: determining an indication of link churn for a linking document providing the linkage data; and based on the link churn, adjusting the ranking of the linked document.
62. The method of claim 61, wherein the indication of link churn is computed as a function of an extent to which one or more links provided by the linking document change over time.
63. The method of claim 62, wherein adjusting the ranking includes penalizing the ranking if the link churn is above a threshold.
So, what is the meaning of link churn here.