2, pay for the room without buying a pair.
3. don't buy a u-shaped building.
4. Don't buy a T-building.
5. Don't buy jagged buildings.
6. Don't buy an I-shaped building.
7. If the open space in front of the building is narrow, don't buy it.
8. Don't buy a big house with a small population.
9. If you have a son who is building a toilet in the east, don't buy it.
10. Don't buy toilets or kitchens in the southwest corner and northwest corner.