You need to read and synthesize chapters 63, 64, and 65 of Guyton and Hall Textbook of Medical Physiology (ISBN: 9780443111013) about the gastrointestinal tract (GIT). The book is in the medical library. The GIT content is in block 8 of this book (pages 792-895) and possibly continues into block 9. The file paths are: - /textbooks/9780443111013/9780443111013_block8.md (4167 lines) - /textbooks/9780443111013/9780443111013_block9.md Chapter 63 is about "Propulsion and Mixing of Food in the Alimentary Tract" Chapter 64 is about "Secretory Functions of the Alimentary Tract" Chapter 65 is about "Digestion and Absorption in the Gastrointestinal Tract" Your job: 1. Read block8.md in chunks (100 lines at a time using read_file with offset/limit) - read ALL 4167 lines 2. Read block9.md (the first 500+ lines or until the GIT chapters end) 3. Identify which sections belong to which chapter 4. Extract and record EVERY section, subsection, and paragraph - do NOT skip anything 5. Return a complete, detailed synthesis of ALL content from chapters 63, 64, and 65 CRITICAL: Read the file in sequential chunks: - offset=0, limit=100 - offset=100, limit=100 - offset=200, limit=100 - ... continue until you reach line 4167 For each chunk, record all headings and content. Then compile the full detailed explanation. Return your response as a comprehensive, detailed explanation of ALL three chapters covering every single topic, mechanism, fact, and concept mentioned. Do not summarize - reproduce the full detail. Use markdown headings to organize by chapter and section.