C11112331333132311331333133313331323132313331211113313133313232232221   >>    C1111233133313231133133313331333132313231333121111331313331323223222   <<    C11112331333132311331333133313331323132313331211113313133313232232223   >>      C11112331333132311331333133313331323132313331211113313133313232232222   >>