Update README.md

LeihuaYe · web-flow · commit a9dc23f891c5 · 2021-01-12T04:23:47.000-08:00
diff --git a/README.md b/README.md
@@ -5,12 +5,15 @@ For the coding part in any Data Science Interviews, there are mainly four compon
 ## Part 1: Math and Statistics: 
 https://towardsdatascience.com/5-python-coding-questions-asked-at-faang-59e6cf5ba2a0
 
-## Part 2: Data Manipulation:
+## Part 2: Data Manipulation, part 1:
 https://towardsdatascience.com/6-python-questions-you-should-practice-before-coding-interviews-f958af55ad13
 
 ## Part 3: Binary Search
 https://towardsdatascience.com/binary-search-in-python-the-programming-algorithm-8b8fa039eaa
 
+## Part 4: Data Manipulation, part 2:
+https://medium.com/@leihua_ye
+
 ## Installing
 We need to install two packages: numpy and matplotlib.pyplot. 
 
