C11112331333132311331333133313331333132313121111331121133132313311212121   >>    C1111233133313231133133313331333133313231312111133112113313231331121212   <<    C11112331333132311331333133313331333132313121111331121133132313311212123   >>      C11112331333132311331333133313331333132313121111331121133132313311212122   >>