Saa 49:30 mtu tafadhali anaweza kunieleza jinsi matrix -b na -k ilivyokuja, nilijaribu sana lakini sikuweza kuelewa, au ninakosa aina fulani ya mahitaji ya awali hapa?####[['-b', 'Mathematical_Related_Concept', 'NEU'], ['-k', 'Mathematical_Related_Concept', 'NEU']]