and three kinds of keys: metal keys, wooden keys, and keys made of horn.” They lifted the latches with the keys and entered, but the dwellings were unprotected. “I allow bolts.” At that time the dwellings had roofs of straw. When the weather was cold, they were cold, and when the weather was hot, they were hot. “I allow you to firm up the structure and then to plaster it inside and outside.” At that time the dwellings did not have windows. It was hard to see and the dwellings were smelly. They told the Buddha. “I allow three kinds of windows: