C11111211113313112113313331333133313133313232233133313231333232132313121   >>    C1111121111331311211331333133313331313331323223313331323133323213231312   <<    C11111211113313112113313331333133313133313232233133313231333232132313123   >>      C11111211113313112113313331333133313133313232233133313231333232132313122   >>