D1121211233131133131323132213231333131323223313232211221123232311   >>    D112121123313113313132313221323133313132322331323221122112323231   <<    D1121211233131133131323132213231333131323223313232211221123232313   >>      D1121211233131133131323132213231333131323223313232211221123232312   >>