Freshman Shen Nianchen checked into dormitory 802, Building C, X University. When he opened the door, he saw a piece of yellowed kraft paper pressed under the bed, with dark red writing like dried blood stains, filled with seven strange instructions:
1. The curtains must be closed before 23:59 every day, and the gap in the curtains must not exceed one finger width;
2. Between 1:00 and 3:00 in the morning, if you hear a knock on the door, you need to count seven times before answering, and you can only say "come in";
3. Black clothing is not allowed on the third floor of the wardrobe. If you find a black shirt that appears inexplicably, you must immediately throw it into the red trash can on the east side of the corridor;
4. The clock hands in the dormitory should never point to "4:44". If this time occurs, it must be covered with a cloth until dawn;
5. You are not allowed to borrow your roommate's comb or let others touch your pillow;
6. There will be a "sleep checker" visiting late every Wednesday night. There is no need to raise your head and look at each other, just answer "obey the rules";
7. If you find that the number of words on the instructions has increased, you must complete the new rules within 24 hours, and you must not inform anyone.
Shen Nianchen was dubious at first, until after ignoring the "no black shirts" rule, a withered hand wrapped around black hair crawled out of the closet; because his roommate responded to the knock on the door in advance, he was found the next day with his eyes slit, and the eighth new red rule under the pillow - "Those who violate the response time limit will permanently lose their right to see property."
