D1121211233131133131323132213231333131323223313232211221123123111   >>    D112121123313113313132313221323133313132322331323221122112312311   <<    D1121211233131133131323132213231333131323223313232211221123123113   >>      D1121211233131133131323132213231333131323223313232211221123123112   >>