C11112331333132311331333133313331323132313331211113313121323311   >>    C1111233133313231133133313331333132313231333121111331312132331   <<    C11112331333132311331333133313331323132313331211113313121323313   >>      C11112331333132311331333133313331323132313331211113313121323312   >>