"It was Chen Qidi who said in his diary, Chen Qidi writes a diary every day, and Mr. Xia has to review it every day, and I once looked through Chen Qidi's diary. In addition to Chen Qidi's diary, I have also read the diaries of other students. ”

"What are the reasons for looking through the students' diaries?"

"Don't you already know? Didn't I sell computers to students? Otherwise, how would I know about the financial situation of the students' families -- I don't want to shout all over the world and end up being known to everyone -- selling computers to the parents of students is not commensurate with the status of a teacher. ”

"Why do you have to choose between half-past four and five?"

"In the morning, I had classes and had no time, and in the afternoon, Teacher Ma was at home, and when there was nothing to do, I asked Teacher Liu to take Teacher Ma away."

"Mr. Ma went to the five-star hypermarket to buy a network card, and you also carefully planned it?"

"I have to push Mr. Ma apart before I can do it."

"Teacher Ma doesn't go out early or late, why do you go out at more than three o'clock?"

"At about three o'clock, I made a call to Mr. Liu."

This call should be an important part of Li Dongting's murder plan.

"How can you be sure that Mr. Ma will definitely go to the five-star hypermarket to buy a network card?"

"I told Teacher Liu that in those days, the District Education Bureau wanted to conduct a comprehensive inspection of the school's work, all teachers had something on hand, the microcomputer room was the focus of the inspection, I couldn't get out, so my computer at home was afraid that it would take a while to debug the Internet, Teacher Liu was very anxious, two granddaughters were urging her every day, I only had time in the afternoon, and she immediately decided to let Teacher Ma buy a network card. In this way, I successfully got Mr. Ma out and went to the five-star hypermarket on Shanxi Road to buy a network card, which took at least two hours to go back and forth. Mr. Ma went out at 3:40 and should have returned home at around 5:40. ”

"How did you know that Mr. Ma walked out of the house at 3:40?"

"I stood in the corridor outside the office and watched Mr. Ma walk out of the community."

"How can you be sure that Mr. Ma will definitely go to the five-star hypermarket?"

"I told Mr. Liu that five-star hypermarkets have network cards for sale."

Li Dongting thought of all the details.

"Before entering Teacher Liu's house, you thought about killing Teacher Liu?"

"Yes."

"Why do you have to kill Chen Qiming and Chen Qidi?"

"They, like Teacher Liu, are also insiders."

"Do they know you bought the computer?"

"Yes. The sisters once asked me when I would be able to access the Internet. If these two jobs are left, no matter how strict my plan is, it will be a bamboo basket for nothing. When Li Dongting said the above paragraph, there was a fierce light in his eyes.

Strangely, the sisters did not mention this in their diaries.

"You killed three people one after another, aren't you afraid that someone will visit Teacher Liu's house?"

"Teacher Liu has a very serious cleanliness habit, and she is also very sandwiched, and most people will not visit her house, I have been to her house a few times, and the relationship between the neighbors and her family is not very good. Every time I went to Mr. Liu's house, the next door neighbor closed the door. ”

"How do you know that Chen Qiming and Chen Qidi don't go home together after school?"

"Chen Qidi's homeroom teacher will leave the students behind to talk about something after school every day. I've noticed that the sisters never go home together after school. ”