D1212121221323132313232332313232233132333132322233313231323132121   >>    D121212122132313231323233231323223313233313232223331323132313212   <<    D1212121221323132313232332313232233132333132322233313231323132123   >>      D1212121221323132313232332313232233132333132322233313231323132122   >>