C11112331333132311331333133313331323132313331211111211113323211   >>    C1111233133313231133133313331333132313231333121111121111332321   <<    C11112331333132311331333133313331323132313331211111211113323213   >>      C11112331333132311331333133313331323132313331211111211113323212   >>