question:  Which item would most likely be shared by Sattell and Pop?
context: His name was Sattell and he had reason not to talk. Pop lived in it all alone, and in his spare time he worked industriously at recovering some missing portions of his life that Sattell had managed to take away from him. Sattell got the shakes when he thought of Pop, and Pop rather probably knew it. All of which happened back on Earth and a long time ago. And Sattell went into panic when he returned. With freight costing what it did, fuel and air and food came frozen solid, in containers barely thicker than foil. While they stayed at space-shadow temperature, the foil would hold anything. At such times Pop hardly thought of Sattell. He'd started to follow Sattell knowing what had happened to his wife and children, but it was hearsay only. When Sattell fled to another continent, Pop followed because he had some distinct memories of his wife—and the way he'd felt about her—and some fugitive mental images of his children. When Sattell frenziedly tried to deny knowledge of the murder in Tangier, Pop had come to remember both his children and some of the happiness of his married life. Even when Sattell—whimpering—signed up for Lunar City, Pop tracked him. If so, Sattell had profited by less than two days' pay for wiping out everything that Pop possessed. But on Earth its contents would be computed in carats, and a hundred pounds was worth millions. The sun rose very, very slowly in what by convention was called the east. Near Sattell, he found memories of times when he was a young man with a young wife who loved him extravagantly. And when he was near Sattell he literally recovered them—in the sense that he came to know new things about them and had new memories of them every day. The occupation made it absurdly easy to live on the surface of the far side of the Moon, whether anybody else could do it or not. Sattell clearly remembered the crime Pop Young hadn't yet recalled.
output:  pencil
options:  hatchet  pencil  lighter  screwdriver