Please pay attention to the following issues about the answer format:
* For Question 3: Unknown LeafValue, there should NOT be any space between the letter x, integers, and the symbols > and <.
For example, your answer should be x>16 instead of x >16 or x > 16 or x> 16.
* For 4) of Question 3, your answer should be either Yes or No.

For any other problems, please feel free to contact the TAs.