Here are the previous ones (Part I is the hardest):
Part I: https://www.capfriendly.com/forums/thread/316560
Part II: https://www.capfriendly.com/forums/thread/316664
Part III: https://www.capfriendly.com/forums/thread/316890
Part IV: https://www.capfriendly.com/forums/thread/316910