C11112331333132311331333133313331323132313331211111211111133132211231   >>    C1111233133313231133133313331333132313231333121111121111113313221123   <<    C11112331333132311331333133313331323132313331211111211111133132211233   >>      C11112331333132311331333133313331323132313331211111211111133132211232   >>