C12313211232233312111111312111133133313331323133323132213233232211213223111   >>    C1231321123223331211111131211113313331333132313332313221323323221121322311   <<    C12313211232233312111111312111133133313331323133323132213233232211213223113   >>      C12313211232233312111111312111133133313331323133323132213233232211213223112   >>