You are a medical research assistant. Read the following textbook sections on acute appendicitis and return ALL the content from each file/line range. Read each file carefully and return the full text content. Files to read (read each one fully in the specified line ranges, use offset/limit to get the right lines): 1. /textbooks/9781265977061/9781265977061_block36.md — lines 1701 to 1900 (Harrison's Principles of Internal Medicine) — This is the PRIMARY source, read ALL of it 2. /textbooks/9781259835346/9781259835346_block14.md — lines 3365 to 3600 (Schwartz's Principles of Surgery) — read ALL of it 3. /textbooks/9780323757898/9780323757898_block14.md — lines 296 to 500 (Rosen's Emergency Medicine) — read ALL of it 4. /textbooks/9780323609623/9780323609623_block2.md — lines 2625 to 2750 (Sleisenger and Fordtran's GI) — read ALL of it 5. /textbooks/9780323790185/9780323790185_block6.md — lines 994 to 1100 (Robbins Basic Pathology) — read ALL of it For each file, use read_file with appropriate offset and limit to capture the content. Read 150 lines at a time. If content continues, read more. Return ALL the raw text content from all these sources. I need: - Etiology and pathogenesis - Clinical features / signs and symptoms - The 18 clinical signs of appendicitis (named signs like Rovsing's, McBurney's, Psoas sign, Obturator sign, etc.) - Complications - Diagnosis (lab, imaging) - Treatment - Peculiarities in children under 5 years Return the complete raw text from all sources so I can synthesize a comprehensive answer.