Task: Program Execution
Input (English): Set1: '{5, 6, 7, 8, 12, 13, 16, 17, 20}', Set2: '{2, 5, 6, 9, 10, 12, 13, 15, 16, 20}'. How many elements are there in the intersection of Set1 and Set2 ?
Output (English): 6