Here are a few code examples to help you get through Nitro 3.6, including the last piece of Nitro 3.5.
I also have a couple short 2-minute videos on De Morgan's Laws.
De Morgan's Law part 1
https://youtu.be/_iQWCPByN14
De Morgan's Law part 2
https://youtu.be/WlZO7wrL5z8