Problem: Does "The territories north of Han's borders were quickly overrun by the nomadic Xianbei confederation." answer the question "Which confederation conquered the territories north of the Han's border?" OPTIONS:
- yes
- no

A: yes

Problem: Does "The fields must be kept clear of debris using cleaning equipment so that loose material does not become a projectile and enter an engine duct (see foreign object damage)." answer the question "What is one part of runway maintenance that helps maintain friction levels?" OPTIONS:
- yes
- no

A: no

Problem: Does "The researchers found that one-fourth of the students asked to imagine the four events reported that they had actually experienced such events as children." answer the question "What did a similar study done by Garry find?" OPTIONS:
- yes
- no

A:
yes