katika 30.41 anaandika "NULL" anasema kuwa S ni eigenvector Matrix lakini hasemi chochote kwa WHAT IS THIS "v small" ,na kwa nini alifanya hila hiyo..inakatisha tamaa####[['NULL', 'Instructor', 'NEG'], ['weka u=Sv', 'Mathematical_Related_Concept', 'NEG']]