C12313211232233312111111312111133133313331323133323132213233232132112212311   >>    C1231321123223331211111131211113313331333132313332313221323323213211221231   <<    C12313211232233312111111312111133133313331323133323132213233232132112212313   >>      C12313211232233312111111312111133133313331323133323132213233232132112212312   >>