C11112331333132311331333133313331323132313331211111133132233111   >>    C1111233133313231133133313331333132313231333121111113313223311   <<    C11112331333132311331333133313331323132313331211111133132233113   >>      C11112331333132311331333133313331323132313331211111133132233112   >>