D1122211211331313331323221123313233313231323112113313233313232212121   >>    D112221121133131333132322112331323331323132311211331323331323221212   <<    D1122211211331313331323221123313233313231323112113313233313232212123   >>      D1122211211331313331323221123313233313231323112113313233313232212122   >>