A transaction database from one grocery shop server is as follows:

Transaction Id	Items
1	Item1, Item2, Item5
2	Item2, Item4
3	Item2, Item3
4	Item1, Item2, Item4
5	Item1, Item3
6	Item2, Item3
7	Item1, Item3
8	Item1, Item2, Item3, Item5
9	Item1, Item2, Item3
10	Item1, Item2, Item3, Item4, Item 5

Assuming a minimum support of 20% (i.e., 2 transactions out of 10).

• Calculate the frequent 1-itemset (L1).
• Calculate the frequent 2-itemset (L2).
• Generate the possible association rules and calculate their level of confidence.

Detailed answer required