Occasionally erected as monuments to enemies killed in battle, balbals are a type of kurgan obelisk—an anthropomorphic stone image made in Central Asia and Eastern Europe from the Copper Age through the Middle Ages. Though they vary in design, balbals commonly depict a person holding a bowl in his upraised right hand or show a warrior holding weapons, usually in the left hand. In 1998, how many anthropomorphic stelae were discovered and excavated in Turkey? Discuss