C1111233131211111211113313331333133313211231211331323133313331331123323311   >>    C111123313121111121111331333133313331321123121133132313331333133112332331   <<    C1111233131211111211113313331333133313211231211331323133313331331123323313   >>      C1111233131211111211113313331333133313211231211331323133313331331123323312   >>