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Punch a wall three to four meters from the long wall and open a door as a bedroom, and the rest as a living room.
The living room of 40 square is a relatively large area, you can hang a large square, add a circle in the middle, if the floor is relatively high, you can hang the top of the three levels more atmospheric.
The width of the ceiling can be between 350 and 450, preferably 400 or 450, you can go to Bai'anju to take a look, it will help you.
It depends on the location of the door, flue, sewer, etc.
Your living room is about 33 square meters, and you can choose a large all-copper three-layer chandelier with a diameter of about one meter.
5 meters wide and 9 meters long house, if you want to make a bedroom and a kitchen, you can choose 5 meters wide and 6 meters long, so that a house, the remaining three meters long to make a kitchen is enough, so that the bedroom is big enough, and the kitchen is not small.