Rules:

1. IF s = medium AND d = medium THEN b = medium								
2. IF s = slow AND d = medium THEN b = weak
3. IF s = very slow AND d = medium THEN b = very weak								
4. IF s = fast AND d = medium THEN b = strong								
5. IF s = very fast AND d = medium THEN b = strong								
6. IF s = medium AND d = short THEN b = medium								
7. IF s = slow AND d = short THEN b = medium								
8. IF s = very slow AND d = short THEN b = weak								
9. IF s = fast AND d = short THEN b = strong								
10. IF s = very fast AND d = short THEN b = very srtong