 Hello and welcome. I am Samuel, your MC-92 support. The first section of MC-92 deals with the challenges of natural language processing. It introduces the basic concepts, compares classical and modern language models, and highlights the differences between earlier AI-based and today's generative chatbots. My recommendation. Use the question sheet of the how to proceed section for guidance. If you can answer the questions, great. If not, either click on the hyperlinks or use chat GPT for help. The mastery test of this unit involves 10 questions about the challenges and the foundations of early and modern natural language processing. To be awarded the mastery badge shown on my right, you have to correctly answer 70% of all the questions. Finally, there are several questions for you in the self-study section. Have a go at them to round off this unit. Good luck and see you.