But in case of Seshu, they could not take over the government position until the specialized skill of each clan was handed down to them through generations, so there was a possibility of losing it unless they were skilled enough even though they were from the family line that had been in the government position for generations.
ただし、世習の場合はそれぞれの氏族が持つ特定の技能を世代を超えて継承されることで初めて官職を世襲することが可能になるものであり、何代も特定の官職を継承してきた家柄でもその能力を満たせなくなればその地位を失う可能性はあった。