D1212132333131313331323331312111133132322132313331323331313232211211   >>    D121213233313131333132333131211113313232213231333132333131323221121   <<    D1212132333131313331323331312111133132322132313331323331313232211213   >>      D1212132333131313331323331312111133132322132313331323331313232211212   >>