The price of each item in a store is nonnegative. The store manager is only interested in rules of certain forms, using the constraints given below. For each of the following cases, identify the kinds of constraint they represent and briefly discuss how to mine such association rules using constraint based pattern mining. (1) Containing items whose sum of the prices is less than $150 (2) Containing one free item and other items whose sum of the prices is at least $200 (3) Where the average price of all the items is between $100 and $500