--- data/input/sample4_modified1.txt	2025-05-08 10:18:46
+++ data/input/sample4_modified2.txt	2025-05-08 10:19:07
@@ -2,7 +2,7 @@
 
 ## Overview
 
-This is a sample project documentation file that demonstrates the unified diff format patch application. The project aims to provide a robust framework for testing and applying patches.
+This is a sample project documentation file that demonstrates the unified diff format patch application. The project aims to provide a robust framework for testing and applying patches in various development environments.
 
 ## Features
 
@@ -11,6 +11,8 @@
 3. Feature C: Optimizes performance
 4. Feature D: Supports multiple file formats
 5. Feature E: Automated testing capabilities
+6. Feature F: Cross-platform compatibility
+7. Feature G: Real-time collaboration
 
 ## Installation
 
@@ -47,8 +49,41 @@
 $ app --help
 $ app --version
 $ app --config=config.json --output=output.log
+$ app --mode=advanced --threads=4
+$ app --import=data.json --export=results.json
 ```
 
+## Configuration
+
+The configuration file supports the following options:
+
+```json
+{
+  "server": {
+    "port": 3000,
+    "host": "localhost"
+  },
+  "database": {
+    "url": "mongodb://localhost:27017",
+    "name": "myapp"
+  },
+  "logging": {
+    "level": "info",
+    "file": "app.log"
+  }
+}
+```
+
+## API Reference
+
+The API provides the following endpoints:
+
+- `GET /api/v1/status` - Check server status
+- `POST /api/v1/users` - Create a new user
+- `GET /api/v1/users/:id` - Get user by ID
+- `PUT /api/v1/users/:id` - Update user
+- `DELETE /api/v1/users/:id` - Delete user
+
 ## Contributing
 
 Contributions are welcome! Please follow these guidelines:
@@ -59,6 +94,14 @@
 - Follow the code style guidelines
 - Submit pull requests for review
 
+## Troubleshooting
+
+Common issues and their solutions:
+
+1. **Installation fails**: Make sure you have the correct Node.js version installed
+2. **Application won't start**: Check if the port is already in use
+3. **Database connection error**: Verify your database is running and accessible
+
 ## License
 
 This project is licensed under the MIT License.
@@ -66,3 +109,7 @@
 ## Acknowledgements
 
 Special thanks to all contributors who have helped make this project possible.
+
+## Contact
+
+For questions or support, please contact us at support@example.com.
