D2311231323331322331313232233132313231323221133132333132312312121   >>    D231123132333132233131323223313231323132322113313233313231231212   <<    D2311231323331322331313232233132313231323221133132333132312312123   >>      D2311231323331322331313232233132313231323221133132333132312312122   >>