It does not seem that the male and female teachers tried to be just. Rather, the number of strokes depended on their momentarily whim. The three first girls (A, B, C) got series OTK, first by the male and then by the female. A got 79 + 135 = 214. B got 107 + 130 = 237. C got 83 + 81 = 164. There is no indication that they had done different transgressions. – The last punishment might have been C again at a later time because of relapse. Anyway, she is placed in a position enabling very much harder strokes. And indeed, a much more painful tool is used, and the teachers are using much more arm muscles. Since the teachers changes much more often I lost my counting, but the number of the strokes was not much over 100. The much greater pain derived from the much hard tool and the much stronger arm muscles. Well, there is no comparison for this girl. But there certainly is for the three first punishments. I feel myself unable to imagine that the teachers had calculated that the girls were guilty of misbehaviours of different size, so that one deserved 4 % above the mean value, the next deserved 16 % above the average, and the third deserves 20 % BELOW. Rather, the last girl got so much less because the teachers had by then satisfied their delight of beating. In videos with voluntary actresses many things must be accepted (and enjoyed by spectators including me). But in a real school I would deem such indulgence in private sentiments to be repulsive.