C1111233131211111211113313331333133313133313231211111333132313232212121   >>    C111123313121111121111331333133313331313331323121111133313231323221212   <<    C1111233131211111211113313331333133313133313231211111333132313232212123   >>      C1111233131211111211113313331333133313133313231211111333132313232212122   >>