context: Air is situated at surface of earth. Computer is situated at plane. Motherboard is not situated at computer. Plane is situated at air. Sale person is not situated at surface of earth. Sale person is situated at school supply section of store. Motherboard is not situated at every city. Duplex is situated at school supply section of store. Air receives action compose primarily of nitrogen and oxygen. Motherboard is not situated at corn. Cable is situated at computer.
text: Air is situated at surface of earth.