There is a phenomenon in nature: when a plant grows alone, it looks short and monotonous, and when it grows with many similar plants, it has deep roots and is full of vitality. People interact with each other in the similar plant kingdom to promote each other. This phenomenon is called the "symbiotic effect". According to the above definitions, Which of the following are most consistent with the symbiotic effect:. ['dormitory of a university, six students have high or low admission scores. Six people studied together in four days for four years, and finally they were admitted to graduate schools of key universities.', 'Living with a wolf, you can only learn to howl; contact with those good people, you will be well affected.', 'In order to get rid of the limitations of self-employment, a brand has adopted a chain operation to expand its business scope, and its sales have greatly increased.', 'pro, villain, far away, so Han also fell.']