The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.

• Abanked with dirt to a height of  
• Bbanked with dirt as high as that of  
• Cbanked them with dirt to a height of  
• Dwas banked with dirt as high as  
• Ewas banked with dirt as high as that of