C11112331333132311331333133313331323132313331211111211111333223313223111   >>    C1111233133313231133133313331333132313231333121111121111133322331322311   <<    C11112331333132311331333133313331323132313331211111211111333223313223113   >>      C11112331333132311331333133313331323132313331211111211111333223313223112   >>