D1212121221323132313232332313232233131133131323223313132313232212111   >>    D121212122132313231323233231323223313113313132322331313231323221211   <<    D1212121221323132313232332313232233131133131323223313132313232212113   >>      D1212121221323132313232332313232233131133131323223313132313232212112   >>