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The Apriori algorithm applied to the database under analysis. The two phases of the Apriori algorithm are highlighted. The first, referred as "join step" phase, aimed at the generation of the candidate itemsets Ck built starting from Lk-1, the frequent itemset of the previous phase. In the second phase the Ck itemsets underwent to a "pruning" procedure that selected the frequent itemsets Lk on the base of the support check.
