D21221323131123313112211231333132322133313133313232233121212231   >>    D2122132313112331311221123133313232213331313331323223312121223   <<    D21221323131123313112211231333132322133313133313232233121212233   >>      D21221323131123313112211231333132322133313133313232233121212232   >>