Xiaohua, Xiaoling, Xiaofang and Xiaoli live in the same dormitory. According to the regulations, students who return to the dormitory at night at the latest should turn off the outdoor street lights. One night, the outdoor street light was not turned off, and the next day, the dormitory administrator came to check which student returned to the dormitory at the latest. Xiaoling said, when I came back. Xiaoli was already asleep
I went to sleep. Xiaohua said, when I came back, Xiaofang was still up. Xiaofang said, when I came in, Xiaoling was still up. Xiaoli said, I fell asleep when I went to bed. I didn't know anything.
Xiaohua will return to the dormitory at the latest