16. One or more non-transitory storage media storing instructions which, when executed by one or more computing devices, cause performance of the method recited in claim 4 .
4. The method of claim 1 , wherein generating the list score for the particular list comprises: for each particular item in the particular list, generating an item score for that particular item by counting a number of times that the particular item occurs within the other lists; and generating the list score for the particular list at least in part by adding together the item scores generated for all items in the particular list.