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Association Rules
In a store we might have I={cheese, ham, bread, butter, salt, coke}.
A transaction could look like: t={cheese, coke} for a customer who bought cheese and coke.
An association rule would be like the following:
bread1butter with support 60% and confidence 80%; which would mean that 60% of the customers bought bread and butter and of those who bought bread, 80% also bought butter.