set of frequent 3-itemsets: {1, 2, 3}, {1, 2, 4}, {1, 2, 5}, {1, 3, 4}, {2, 3, 4}, {2, 3, 5} a) List all candidate 4-itemsets that can be generated by combining any two 3-itemsets from the above list. b) Prune your list of the candidate 4-itemsets using the Apriori principle and list candidate 4-itemsets that survive the candidate pruning step. (Hint: a candidate 4-itemset cannot be frequent if any of its subset is not frequent. Also, note that any 3-itemset that is not in the above list is not frequent.

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