C11112331333132311331333133313331323132313331211113311221123232212121   >>    C1111233133313231133133313331333132313231333121111331122112323221212   <<    C11112331333132311331333133313331323132313331211113311221123232212123   >>      C11112331333132311331333133313331323132313331211113311221123232212122   >>