Task: Program Execution
Input (English): Set1: '{1, 3, 4, 10, 12, 13, 15, 17, 18, 19}', Set2: '{2, 3, 4, 5, 6, 7, 10, 11, 16}'. How many elements are there in the union of Set1 and Set2 ?
Output (English): 16