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After the lesson, he would have to erase the blackboard, and with Pei Yin's current height, he would have to move a stool on top of the blackboard to erase the blackboard.

As soon as he finished his lesson, the daily duty team leader said to Pei Yin: "Shen Pei Yin, clean the blackboard today."

Pei Yin stood up, tilted his head, looked at the team leader, and said: "I am short