In a group, "free-riding" refers to the phenomenon in which individuals benefit from other members of the group without doing anything. The straw effect refers to when an individual finds that some members of the group enjoy "free-riding". , The individual will reduce the phenomenon of effort, that is, the individual would prefer to reduce the level of effort, while bearing the consequences of reduced returns, rather than being a "dropper" and being "free-ridden" by others. According to the above definition, Which of the following are the effects of the straw. ["Xiao Zhang loves to clean and often actively cleans the dormitory. Soon after, he finds that other roommates no longer clean the dormitory. Since then, even if he feels that the dormitory's sanitary condition makes him uncomfortable, he no longer cleans it.", "Xiao Liu's company completes the task as a team, and all team members will receive the same reward after completing the task. Xiao Liu feels that even if he tries harder, he won't get more rewards, so the work is not so hard.", "The rules of the team competition stipulate that the team's last performance is the team's performance. Xiaofang finds that one member of his team is slow to complete the task. He feels that his team can't win, so he doesn't go all out.", 'Xiaojiang is a member of the Propaganda Department of the Student Union. When the Student Union organizes the school\'s academic forum, the Propaganda Department is responsible for the design of posters and picture albums. Xiaojiang is not active. He knows that these results will be signed as "Student Union" without a personal signature.']