If dusty winds are blowing from the east, he should close the windows on the eastern side. If dusty winds are blowing from the west, he should close the windows on the western side. If dusty winds are blowing from the north, he should close the windows on the northern side. If dusty winds are blowing from the south, he should close the windows on the southern side. If the weather is cold, he should open the windows during the day and close them at night. If the weather is hot, he should close the windows during the day and open them at night. If the yard is dirty, he should sweep it. If the gatehouse is dirty, he should sweep it. If the assembly hall is dirty, he should sweep it. If the water-boiling shed is dirty, he should sweep it.