Mainly because every respondent was allowed to pick appealing and unattractive jobs, there is some list overlap. https://bettingzblog.com/%EC%97%AC%EC%84%B1%EC%9D%84-%EC%9C%84%ED%95%9C-%EC%95%8C%EB%B0%94%EC%97%B0%EB%B4%89-%EA%B0%80%EC%9D%B4%EB%93%9C-%EA%B5%AC%EC%9D%B8%EA%B3%B5%EA%B3%A0%EC%99%80-%EC%9D%B8%EC%9E%AC%EC%A0%95%EB%B3%B4/